diff --git a/code/3DSConverter.cpp b/code/3DSConverter.cpp
index d5a83461c..00ea6deda 100644
--- a/code/3DSConverter.cpp
+++ b/code/3DSConverter.cpp
@@ -757,7 +757,7 @@ void Discreet3DSImporter::GenerateNodeGraph(aiScene* pcOut)
 			pcNode->mNumMeshes = 1;
 
 			// Build a name for the node
-			pcNode->mName.length = sprintf(pcNode->mName.data,"3DSMesh_%i",i);	
+			pcNode->mName.length = sprintf(pcNode->mName.data,"3DSMesh_%u",i);	
 		}
 
 		// Build dummy nodes for all cameras
diff --git a/code/ASEParser.cpp b/code/ASEParser.cpp
index 7e16c43ed..7c254f8ba 100644
--- a/code/ASEParser.cpp
+++ b/code/ASEParser.cpp
@@ -143,9 +143,9 @@ void Parser::LogWarning(const char* szWarn)
 
 	char szTemp[1024];
 #if _MSC_VER >= 1400
-	sprintf_s(szTemp,"Line %i: %s",iLineNumber,szWarn);
+	sprintf_s(szTemp,"Line %u: %s",iLineNumber,szWarn);
 #else
-	snprintf(szTemp,1024,"Line %i: %s",iLineNumber,szWarn);
+	snprintf(szTemp,1024,"Line %u: %s",iLineNumber,szWarn);
 #endif
 
 	// output the warning to the logger ...
@@ -159,9 +159,9 @@ void Parser::LogInfo(const char* szWarn)
 
 	char szTemp[1024];
 #if _MSC_VER >= 1400
-	sprintf_s(szTemp,"Line %i: %s",iLineNumber,szWarn);
+	sprintf_s(szTemp,"Line %u: %s",iLineNumber,szWarn);
 #else
-	snprintf(szTemp,1024,"Line %i: %s",iLineNumber,szWarn);
+	snprintf(szTemp,1024,"Line %u: %s",iLineNumber,szWarn);
 #endif
 
 	// output the information to the logger ...
@@ -175,9 +175,9 @@ AI_WONT_RETURN void Parser::LogError(const char* szWarn)
 
 	char szTemp[1024];
 #if _MSC_VER >= 1400
-	sprintf_s(szTemp,"Line %i: %s",iLineNumber,szWarn);
+	sprintf_s(szTemp,"Line %u: %s",iLineNumber,szWarn);
 #else
-	snprintf(szTemp,1024,"Line %i: %s",iLineNumber,szWarn);
+	snprintf(szTemp,1024,"Line %u: %s",iLineNumber,szWarn);
 #endif
 
 	// throw an exception
diff --git a/code/DeboneProcess.cpp b/code/DeboneProcess.cpp
index 025a2ca76..05d33a464 100644
--- a/code/DeboneProcess.cpp
+++ b/code/DeboneProcess.cpp
@@ -147,7 +147,7 @@ void DeboneProcess::Execute( aiScene* pScene)
 						   
 				if(!DefaultLogger::isNullLogger()) {
 					char buffer[1024];
-					::sprintf(buffer,"Removed %i bones. Input bones: %i. Output bones: %i",in-out,in,out);
+					::sprintf(buffer,"Removed %u bones. Input bones: %u. Output bones: %u",in-out,in,out);
 					DefaultLogger::get()->info(buffer);
 				}
 
diff --git a/code/DefaultLogger.cpp b/code/DefaultLogger.cpp
index b78b2abd6..f1bbd0c9f 100644
--- a/code/DefaultLogger.cpp
+++ b/code/DefaultLogger.cpp
@@ -258,7 +258,7 @@ void DefaultLogger::OnDebug( const char* message )
 		return;
 
 	char msg[MAX_LOG_MESSAGE_LENGTH + 16];
-	::sprintf(msg,"Debug, T%i: %s", GetThreadID(), message );
+	::sprintf(msg,"Debug, T%u: %s", GetThreadID(), message );
 
 	WriteToStreams( msg, Logger::Debugging );
 }
@@ -268,7 +268,7 @@ void DefaultLogger::OnDebug( const char* message )
 void DefaultLogger::OnInfo( const char* message )
 {
 	char msg[MAX_LOG_MESSAGE_LENGTH + 16];
-	::sprintf(msg,"Info,  T%i: %s", GetThreadID(), message );
+	::sprintf(msg,"Info,  T%u: %s", GetThreadID(), message );
 
 	WriteToStreams( msg , Logger::Info );
 }
@@ -278,7 +278,7 @@ void DefaultLogger::OnInfo( const char* message )
 void DefaultLogger::OnWarn( const char* message )
 {
 	char msg[MAX_LOG_MESSAGE_LENGTH + 16];
-	::sprintf(msg,"Warn,  T%i: %s", GetThreadID(), message );
+	::sprintf(msg,"Warn,  T%u: %s", GetThreadID(), message );
 
 	WriteToStreams( msg, Logger::Warn );
 }
@@ -288,7 +288,7 @@ void DefaultLogger::OnWarn( const char* message )
 void DefaultLogger::OnError( const char* message )
 {
 	char msg[MAX_LOG_MESSAGE_LENGTH + 16];
-	::sprintf(msg,"Error, T%i: %s", GetThreadID(), message );
+	::sprintf(msg,"Error, T%u: %s", GetThreadID(), message );
 
 	WriteToStreams( msg, Logger::Err );
 }
diff --git a/code/IRRLoader.cpp b/code/IRRLoader.cpp
index b082168c1..d3890b601 100644
--- a/code/IRRLoader.cpp
+++ b/code/IRRLoader.cpp
@@ -194,7 +194,7 @@ void IRRImporter::BuildSkybox(std::vector<aiMesh*>& meshes, std::vector<aiMateri
 		aiMaterial* out = ( aiMaterial* ) (*(materials.end()-(6-i)));
 
 		aiString s;
-		s.length = ::sprintf( s.data, "SkyboxSide_%i",i );
+		s.length = ::sprintf( s.data, "SkyboxSide_%u",i );
 		out->AddProperty(&s,AI_MATKEY_NAME);
 
 		int shading = aiShadingMode_NoShading;
diff --git a/code/LWOLoader.cpp b/code/LWOLoader.cpp
index fd29f23f1..188afc5f4 100644
--- a/code/LWOLoader.cpp
+++ b/code/LWOLoader.cpp
@@ -209,7 +209,7 @@ void LWOImporter::InternReadFile( const std::string& pFile,
 		// we need to check now whether the requested layer has been found.
 		if (UINT_MAX != configLayerIndex) {
 			unsigned int layerCount = 0;
-			for(std::list<LWO::Layer>::iterator itLayers=mLayers->begin(); itLayers!=mLayers->end(); itLayers++)
+			for(std::list<LWO::Layer>::iterator itLayers=mLayers->begin(); itLayers!=mLayers->end(); ++itLayers)
 				if (!itLayers->skip)
 					layerCount++;
 			if (layerCount!=2)
diff --git a/code/LWSLoader.cpp b/code/LWSLoader.cpp
index cb0daf2e9..161d90fa6 100644
--- a/code/LWSLoader.cpp
+++ b/code/LWSLoader.cpp
@@ -450,7 +450,7 @@ void LWSImporter::BuildGraph(aiNode* nd, LWS::NodeDesc& src, std::vector<Attachm
 	}
 
 	// Add children
-	if (src.children.size()) {
+	if (!src.children.empty()) {
 		nd->mChildren = new aiNode*[src.children.size()];
 		for (std::list<LWS::NodeDesc*>::iterator it = src.children.begin(); it != src.children.end(); ++it) {
 			aiNode* ndd = nd->mChildren[nd->mNumChildren++] = new aiNode();
diff --git a/code/LimitBoneWeightsProcess.cpp b/code/LimitBoneWeightsProcess.cpp
index 3f46dd100..53e5ce360 100644
--- a/code/LimitBoneWeightsProcess.cpp
+++ b/code/LimitBoneWeightsProcess.cpp
@@ -193,7 +193,7 @@ void LimitBoneWeightsProcess::ProcessMesh( aiMesh* pMesh)
 
 		if (!DefaultLogger::isNullLogger()) {
 			char buffer[1024];
-			::sprintf(buffer,"Removed %i weights. Input bones: %i. Output bones: %i",removed,old_bones,pMesh->mNumBones);
+			::sprintf(buffer,"Removed %u weights. Input bones: %u. Output bones: %u",removed,old_bones,pMesh->mNumBones);
 			DefaultLogger::get()->info(buffer);
 		}
 	}
diff --git a/code/MD3Loader.cpp b/code/MD3Loader.cpp
index a78a5e3f2..cf07f295f 100644
--- a/code/MD3Loader.cpp
+++ b/code/MD3Loader.cpp
@@ -791,7 +791,7 @@ void MD3Importer::InternReadFile( const std::string& pFile,
 
 	// Adjust all texture paths in the shader
 	const char* header_name = pcHeader->NAME;
-	if (shaders.blocks.size()) {
+	if (!shaders.blocks.empty()) {
 		for (std::list< Q3Shader::ShaderDataBlock >::iterator dit = shaders.blocks.begin(); dit != shaders.blocks.end(); ++dit) {
 			ConvertPath((*dit).name.c_str(),header_name,(*dit).name);
 
@@ -881,7 +881,7 @@ void MD3Importer::InternReadFile( const std::string& pFile,
 
 		// Now search the current shader for a record with this name (
 		// excluding texture file extension)
-		if (shaders.blocks.size()) {
+		if (!shaders.blocks.empty()) {
 
 			std::string::size_type s = convertedPath.find_last_of('.');
 			if (s == std::string::npos)
diff --git a/code/MD5Parser.cpp b/code/MD5Parser.cpp
index 6be956593..395dedd14 100644
--- a/code/MD5Parser.cpp
+++ b/code/MD5Parser.cpp
@@ -95,7 +95,7 @@ MD5Parser::MD5Parser(char* _buffer, unsigned int _fileSize )
 /*static*/ AI_WONT_RETURN void MD5Parser::ReportError (const char* error, unsigned int line)
 {
 	char szBuffer[1024];
-	::sprintf(szBuffer,"[MD5] Line %i: %s",line,error);
+	::sprintf(szBuffer,"[MD5] Line %u: %s",line,error);
 	throw DeadlyImportError(szBuffer);
 }
 
@@ -104,7 +104,7 @@ MD5Parser::MD5Parser(char* _buffer, unsigned int _fileSize )
 /*static*/ void MD5Parser::ReportWarning (const char* warn, unsigned int line)
 {
 	char szBuffer[1024]; 
-	::sprintf(szBuffer,"[MD5] Line %i: %s",line,warn);
+	::sprintf(szBuffer,"[MD5] Line %u: %s",line,warn);
 	DefaultLogger::get()->warn(szBuffer);
 }
 
diff --git a/code/MDLLoader.cpp b/code/MDLLoader.cpp
index b2de6bfe5..320956cc1 100644
--- a/code/MDLLoader.cpp
+++ b/code/MDLLoader.cpp
@@ -264,7 +264,7 @@ void MDLImporter::SizeCheck(const void* szPos, const char* szFile, unsigned int
 
 		char szBuffer[1024];
 		::sprintf(szBuffer,"Invalid MDL file. The file is too small "
-			"or contains invalid data (File: %s Line: %i)",szFilePtr,iLine);
+			"or contains invalid data (File: %s Line: %u)",szFilePtr,iLine);
 
 		throw DeadlyImportError(szBuffer);
 	}
@@ -1536,7 +1536,7 @@ void MDLImporter::InternReadFile_3DGS_MDL7( )
 			// setup the name of the node
 			char* const szBuffer = &aszGroupNameBuffer[i*AI_MDL7_MAX_GROUPNAMESIZE];
 			if ('\0' == *szBuffer)
-				pcNode->mName.length = ::sprintf(szBuffer,"Group_%i",p);
+				pcNode->mName.length = ::sprintf(szBuffer,"Group_%u",p);
 			else pcNode->mName.length = ::strlen(szBuffer);
 			::strcpy(pcNode->mName.data,szBuffer);
 			++p;
diff --git a/code/MS3DLoader.cpp b/code/MS3DLoader.cpp
index 341ee6674..e7ad85881 100644
--- a/code/MS3DLoader.cpp
+++ b/code/MS3DLoader.cpp
@@ -531,7 +531,7 @@ void MS3DImporter::InternReadFile( const std::string& pFile,
 		}
 
 		// allocate storage for bones
-		if(mybones.size()) {
+		if(!mybones.empty()) {
 			std::vector<unsigned int> bmap(joints.size());
 			m->mBones = new aiBone*[mybones.size()]();
 			for(BoneSet::const_iterator it = mybones.begin(); it != mybones.end(); ++it) {
diff --git a/code/NFFLoader.cpp b/code/NFFLoader.cpp
index f180ba988..2d8c0d5da 100644
--- a/code/NFFLoader.cpp
+++ b/code/NFFLoader.cpp
@@ -1115,7 +1115,7 @@ void NFFImporter::InternReadFile( const std::string& pFile,
 			aiNode* nd = *ppcChildren  = new aiNode();
 			nd->mParent = root;
 
-			nd->mName.length = ::sprintf(nd->mName.data,"<NFF_Light%i>",i);
+			nd->mName.length = ::sprintf(nd->mName.data,"<NFF_Light%u>",i);
 
 			// allocate the light in the scene data structure
 			aiLight* out = pScene->mLights[i] = new aiLight();
diff --git a/code/ObjExporter.cpp b/code/ObjExporter.cpp
index 099b337da..90f4241eb 100644
--- a/code/ObjExporter.cpp
+++ b/code/ObjExporter.cpp
@@ -288,7 +288,7 @@ int ObjExporter::vecIndexMap::getIndex(const aiVector3D& vec)
 void ObjExporter::vecIndexMap::getVectors( std::vector<aiVector3D>& vecs )
 {
 	vecs.resize(vecMap.size());
-	for(vecIndexMap::dataType::iterator it = vecMap.begin(); it != vecMap.end(); it++){
+	for(vecIndexMap::dataType::iterator it = vecMap.begin(); it != vecMap.end(); ++it){
 		vecs[it->second-1] = it->first;
 	}
 }
diff --git a/code/ObjFileParser.h b/code/ObjFileParser.h
index 1883b7260..8a8a51306 100644
--- a/code/ObjFileParser.h
+++ b/code/ObjFileParser.h
@@ -122,6 +122,11 @@ private:
     void reportErrorTokenInFace();
 
 private:
+	// Copy and assignment constructor should be private 
+	// because the class contains pointer to allocated memory
+    ObjFileParser(const ObjFileParser& rhs);
+	ObjFileParser& operator=(const ObjFileParser& rhs);
+
     ///	Default material name
     static const std::string DEFAULT_MATERIAL;
     //!	Iterator to current position in buffer
diff --git a/code/OgreImporter.h b/code/OgreImporter.h
index 1b4b608f6..b37ec2d75 100644
--- a/code/OgreImporter.h
+++ b/code/OgreImporter.h
@@ -81,7 +81,7 @@ private:
 	void AssignMaterials(aiScene *pScene, std::vector<aiMaterial*> &materials);
 	
 	/// Reads material
-	aiMaterial* ReadMaterial(const std::string &pFile, Assimp::IOSystem *pIOHandler, const std::string MaterialName);
+	aiMaterial* ReadMaterial(const std::string &pFile, Assimp::IOSystem *pIOHandler, const std::string &MaterialName);
 
 	// These functions parse blocks from a material file from @c ss. Starting parsing from "{" and ending it to "}".
 	bool ReadTechnique(const std::string &techniqueName, std::stringstream &ss, aiMaterial *material);
diff --git a/code/OgreMaterial.cpp b/code/OgreMaterial.cpp
index cf8951549..a5eb6fb19 100644
--- a/code/OgreMaterial.cpp
+++ b/code/OgreMaterial.cpp
@@ -120,7 +120,7 @@ void OgreImporter::AssignMaterials(aiScene *pScene, std::vector<aiMaterial*> &ma
 	}
 }
 
-aiMaterial* OgreImporter::ReadMaterial(const std::string &pFile, Assimp::IOSystem *pIOHandler, const std::string materialName)
+aiMaterial* OgreImporter::ReadMaterial(const std::string &pFile, Assimp::IOSystem *pIOHandler, const std::string &materialName)
 {
 	if (materialName.empty()) {
 		return 0;
diff --git a/code/OpenGEXImporter.cpp b/code/OpenGEXImporter.cpp
index 7065bbe81..a5736ce0f 100644
--- a/code/OpenGEXImporter.cpp
+++ b/code/OpenGEXImporter.cpp
@@ -300,7 +300,7 @@ void OpenGEXImporter::handleNodes( DDLNode *node, aiScene *pScene ) {
     }
 
     DDLNode::DllNodeList childs = node->getChildNodeList();
-    for( DDLNode::DllNodeList::iterator it = childs.begin(); it != childs.end(); it++ ) {
+    for( DDLNode::DllNodeList::iterator it = childs.begin(); it != childs.end(); ++it ) {
         Grammar::TokenType tokenType( Grammar::matchTokenType( ( *it )->getType().c_str() ) );
         switch( tokenType ) {
             case Grammar::MetricToken:
diff --git a/code/OptimizeGraph.cpp b/code/OptimizeGraph.cpp
index 25dca7923..22e27bfac 100644
--- a/code/OptimizeGraph.cpp
+++ b/code/OptimizeGraph.cpp
@@ -225,7 +225,7 @@ void OptimizeGraphProcess::CollectNewChildren(aiNode* nd, std::list<aiNode*>& no
 
 		delete[] nd->mChildren;
 
-		if (child_nodes.size())
+		if (!child_nodes.empty())
 			nd->mChildren = new aiNode*[child_nodes.size()];
 		else nd->mChildren = NULL;
 	}
@@ -335,7 +335,7 @@ void OptimizeGraphProcess::Execute( aiScene* pScene)
 		if ( nodes_in != nodes_out) {
 
 			char buf[512];
-			sprintf(buf,"OptimizeGraphProcess finished; Input nodes: %i, Output nodes: %i",nodes_in,nodes_out);
+			sprintf(buf,"OptimizeGraphProcess finished; Input nodes: %u, Output nodes: %u",nodes_in,nodes_out);
 			DefaultLogger::get()->info(buf);
 		}
 		else DefaultLogger::get()->debug("OptimizeGraphProcess finished");
diff --git a/code/OptimizeMeshes.cpp b/code/OptimizeMeshes.cpp
index 870369315..f17fb5a20 100644
--- a/code/OptimizeMeshes.cpp
+++ b/code/OptimizeMeshes.cpp
@@ -150,7 +150,7 @@ void OptimizeMeshesProcess::Execute( aiScene* pScene)
 
 	if (output.size() != num_old) {
 		char tmp[512];
-		::sprintf(tmp,"OptimizeMeshesProcess finished. Input meshes: %i, Output meshes: %i",num_old,pScene->mNumMeshes);
+		::sprintf(tmp,"OptimizeMeshesProcess finished. Input meshes: %u, Output meshes: %u",num_old,pScene->mNumMeshes);
 		DefaultLogger::get()->info(tmp);
     } else {
         DefaultLogger::get()->debug( "OptimizeMeshesProcess finished" );
diff --git a/code/PretransformVertices.cpp b/code/PretransformVertices.cpp
index 1c7a9a4e0..c98647c1a 100644
--- a/code/PretransformVertices.cpp
+++ b/code/PretransformVertices.cpp
@@ -644,7 +644,7 @@ void PretransformVertices::Execute( aiScene* pScene)
 			{
 				aiNode* pcNode = *nodes = new aiNode();
 				pcNode->mParent = pScene->mRootNode;
-				pcNode->mName.length = ::sprintf(pcNode->mName.data,"mesh_%i",i);
+				pcNode->mName.length = ::sprintf(pcNode->mName.data,"mesh_%u",i);
 
 				// setup mesh indices
 				pcNode->mNumMeshes = 1;
@@ -656,7 +656,7 @@ void PretransformVertices::Execute( aiScene* pScene)
 			{
 				aiNode* pcNode = *nodes = new aiNode();
 				pcNode->mParent = pScene->mRootNode;
-				pcNode->mName.length = ::sprintf(pcNode->mName.data,"light_%i",i);
+				pcNode->mName.length = ::sprintf(pcNode->mName.data,"light_%u",i);
 				pScene->mLights[i]->mName = pcNode->mName;
 			}
 			// generate camera nodes
@@ -664,7 +664,7 @@ void PretransformVertices::Execute( aiScene* pScene)
 			{
 				aiNode* pcNode = *nodes = new aiNode();
 				pcNode->mParent = pScene->mRootNode;
-				pcNode->mName.length = ::sprintf(pcNode->mName.data,"cam_%i",i);
+				pcNode->mName.length = ::sprintf(pcNode->mName.data,"cam_%u",i);
 				pScene->mCameras[i]->mName = pcNode->mName;
 			}
 		}
@@ -707,15 +707,15 @@ void PretransformVertices::Execute( aiScene* pScene)
 
 		DefaultLogger::get()->debug("PretransformVerticesProcess finished");
 
-		sprintf(buffer,"Removed %i nodes and %i animation channels (%i output nodes)",
+		sprintf(buffer,"Removed %u nodes and %u animation channels (%u output nodes)",
 			iOldNodes,iOldAnimationChannels,CountNodes(pScene->mRootNode));
 		DefaultLogger::get()->info(buffer);
 
-		sprintf(buffer,"Kept %i lights and %i cameras",
+		sprintf(buffer,"Kept %u lights and %u cameras",
 			pScene->mNumLights,pScene->mNumCameras);
 		DefaultLogger::get()->info(buffer);
 
-		sprintf(buffer,"Moved %i meshes to WCS (number of output meshes: %i)",
+		sprintf(buffer,"Moved %u meshes to WCS (number of output meshes: %u)",
 			iOldMeshes,pScene->mNumMeshes);
 		DefaultLogger::get()->info(buffer);
 	}
diff --git a/code/RemoveRedundantMaterials.cpp b/code/RemoveRedundantMaterials.cpp
index 2c760db0c..d3dfb6cae 100644
--- a/code/RemoveRedundantMaterials.cpp
+++ b/code/RemoveRedundantMaterials.cpp
@@ -180,7 +180,7 @@ void RemoveRedundantMatsProcess::Execute( aiScene* pScene)
 				if (ppcMaterials[idx]) 
 				{
 					aiString sz;
-					sz.length = ::sprintf(sz.data,"JoinedMaterial_#%i",p);
+					sz.length = ::sprintf(sz.data,"JoinedMaterial_#%u",p);
 					((aiMaterial*)ppcMaterials[idx])->AddProperty(&sz,AI_MATKEY_NAME);
 				}
 				else
@@ -207,7 +207,7 @@ void RemoveRedundantMatsProcess::Execute( aiScene* pScene)
 	else 
 	{
 		char szBuffer[128]; // should be sufficiently large
-		::sprintf(szBuffer,"RemoveRedundantMatsProcess finished. Removed %i redundant and %i unused materials.",
+		::sprintf(szBuffer,"RemoveRedundantMatsProcess finished. Removed %u redundant and %u unused materials.",
 			redundantRemoved,unreferencedRemoved);
 		DefaultLogger::get()->info(szBuffer);
 	}
diff --git a/code/SMDLoader.cpp b/code/SMDLoader.cpp
index 31c8c4fda..78c33e8c2 100644
--- a/code/SMDLoader.cpp
+++ b/code/SMDLoader.cpp
@@ -208,7 +208,7 @@ void SMDImporter::InternReadFile( const std::string& pFile, aiScene* pScene, IOS
 void SMDImporter::LogErrorNoThrow(const char* msg)
 {
 	char szTemp[1024];
-	sprintf(szTemp,"Line %i: %s",iLineNumber,msg);
+	sprintf(szTemp,"Line %u: %s",iLineNumber,msg);
 	DefaultLogger::get()->error(szTemp);
 }
 
@@ -218,7 +218,7 @@ void SMDImporter::LogWarning(const char* msg)
 {
 	char szTemp[1024];
 	ai_assert(strlen(msg) < 1000);
-	sprintf(szTemp,"Line %i: %s",iLineNumber,msg);
+	sprintf(szTemp,"Line %u: %s",iLineNumber,msg);
 	DefaultLogger::get()->warn(szTemp);
 }
 
@@ -647,7 +647,7 @@ void SMDImporter::CreateOutputMaterials()
 		pScene->mMaterials[iMat] = pcMat;
 
 		aiString szName;
-		szName.length = (size_t)::sprintf(szName.data,"Texture_%i",iMat);
+		szName.length = (size_t)::sprintf(szName.data,"Texture_%u",iMat);
 		pcMat->AddProperty(&szName,AI_MATKEY_NAME);
 
 		if (aszTextures[iMat].length())
diff --git a/code/StepExporter.cpp b/code/StepExporter.cpp
index 845396780..58e0aa69e 100644
--- a/code/StepExporter.cpp
+++ b/code/StepExporter.cpp
@@ -251,7 +251,7 @@ void StepExporter::WriteFile()
 	mOutput << "))" << endstr;
 
 	// write all the unique transformed CARTESIAN and VERTEX
-	for (MeshesByNodeMap::const_iterator it2 = meshes.begin(); it2 != meshes.end(); it2++)
+	for (MeshesByNodeMap::const_iterator it2 = meshes.begin(); it2 != meshes.end(); ++it2)
 	{
 		const aiNode& node = *(*it2).first;
 		unsigned int mesh_idx = (*it2).second;
diff --git a/code/UnrealLoader.cpp b/code/UnrealLoader.cpp
index 163af55a4..19b42b196 100644
--- a/code/UnrealLoader.cpp
+++ b/code/UnrealLoader.cpp
@@ -377,7 +377,7 @@ void UnrealImporter::InternReadFile( const std::string& pFile,
 		aiColor3D color(1.f,1.f,1.f);
 
 		aiString s;
-		::sprintf(s.data,"mat%i_tx%i_",i,materials[i].tex);
+		::sprintf(s.data,"mat%u_tx%u_",i,materials[i].tex);
 
 		// set the two-sided flag
 		if (materials[i].type == Unreal::MF_NORMAL_TS) {