diff --git a/code/ObjFileImporter.cpp b/code/ObjFileImporter.cpp
index 97ae29996..d93d9c97e 100644
--- a/code/ObjFileImporter.cpp
+++ b/code/ObjFileImporter.cpp
@@ -152,7 +152,7 @@ void ObjFileImporter::InternReadFile( const std::string &file, aiScene* pScene,
     unsigned int progress = 0;
     unsigned int progressCounter = 0;
     const unsigned int updateProgressEveryBytes = 100 * 1024;
-    const unsigned int progressTotal = (3*m_Buffer.size()/updateProgressEveryBytes);
+    const unsigned int progressTotal = static_cast<unsigned int>(3*m_Buffer.size()/updateProgressEveryBytes);
     // process all '\'
     /*std::vector<char> ::iterator iter = m_Buffer.begin();
     while (iter != m_Buffer.end())
@@ -326,10 +326,10 @@ aiMesh *ObjFileImporter::createTopology( const ObjFile::Model* pModel, const Obj
         ai_assert( NULL != inp  );
 
         if (inp->m_PrimitiveType == aiPrimitiveType_LINE) {
-            pMesh->mNumFaces += inp->m_vertices.size() - 1;
+            pMesh->mNumFaces += static_cast<unsigned int>(inp->m_vertices.size() - 1);
             pMesh->mPrimitiveTypes |= aiPrimitiveType_LINE;
         } else if (inp->m_PrimitiveType == aiPrimitiveType_POINT) {
-            pMesh->mNumFaces += inp->m_vertices.size();
+            pMesh->mNumFaces += static_cast<unsigned int>(inp->m_vertices.size());
             pMesh->mPrimitiveTypes |= aiPrimitiveType_POINT;
         } else {
             ++pMesh->mNumFaces;
diff --git a/code/ObjFileMtlImporter.cpp b/code/ObjFileMtlImporter.cpp
index 0228ef224..f6dc739ab 100644
--- a/code/ObjFileMtlImporter.cpp
+++ b/code/ObjFileMtlImporter.cpp
@@ -307,49 +307,49 @@ void ObjFileMtlImporter::getTexture() {
     int clampIndex = -1;
 
     const char *pPtr( &(*m_DataIt) );
-    if ( !ASSIMP_strincmp( pPtr, DiffuseTexture.c_str(), DiffuseTexture.size() ) ) {
+    if ( !ASSIMP_strincmp( pPtr, DiffuseTexture.c_str(), static_cast<unsigned int>(DiffuseTexture.size()) ) ) {
         // Diffuse texture
         out = & m_pModel->m_pCurrentMaterial->texture;
         clampIndex = ObjFile::Material::TextureDiffuseType;
-    } else if ( !ASSIMP_strincmp( pPtr,AmbientTexture.c_str(),AmbientTexture.size() ) ) {
+    } else if ( !ASSIMP_strincmp( pPtr,AmbientTexture.c_str(), static_cast<unsigned int>(AmbientTexture.size()) ) ) {
         // Ambient texture
         out = & m_pModel->m_pCurrentMaterial->textureAmbient;
         clampIndex = ObjFile::Material::TextureAmbientType;
-    } else if (!ASSIMP_strincmp( pPtr, SpecularTexture.c_str(), SpecularTexture.size())) {
+    } else if (!ASSIMP_strincmp( pPtr, SpecularTexture.c_str(), static_cast<unsigned int>(SpecularTexture.size()) ) ) {
         // Specular texture
         out = & m_pModel->m_pCurrentMaterial->textureSpecular;
         clampIndex = ObjFile::Material::TextureSpecularType;
-    } else if ( !ASSIMP_strincmp( pPtr, OpacityTexture.c_str(), OpacityTexture.size() ) ) {
+    } else if ( !ASSIMP_strincmp( pPtr, OpacityTexture.c_str(), static_cast<unsigned int>(OpacityTexture.size()) ) ) {
         // Opacity texture
         out = & m_pModel->m_pCurrentMaterial->textureOpacity;
         clampIndex = ObjFile::Material::TextureOpacityType;
-    } else if (!ASSIMP_strincmp( pPtr, EmmissiveTexture.c_str(), EmmissiveTexture.size())) {
+    } else if (!ASSIMP_strincmp( pPtr, EmmissiveTexture.c_str(), static_cast<unsigned int>(EmmissiveTexture.size()) ) ) {
         // Emissive texture
         out = & m_pModel->m_pCurrentMaterial->textureEmissive;
         clampIndex = ObjFile::Material::TextureEmissiveType;
-    } else if ( !ASSIMP_strincmp( pPtr, EmmissiveTexture_1.c_str(), EmmissiveTexture_1.size() ) ) {
+    } else if ( !ASSIMP_strincmp( pPtr, EmmissiveTexture_1.c_str(), static_cast<unsigned int>(EmmissiveTexture_1.size()) ) ) {
         // Emissive texture
         out = &m_pModel->m_pCurrentMaterial->textureEmissive;
         clampIndex = ObjFile::Material::TextureEmissiveType;
-    } else if ( !ASSIMP_strincmp( pPtr, BumpTexture1.c_str(), BumpTexture1.size() ) ||
-                !ASSIMP_strincmp( pPtr, BumpTexture2.c_str(), BumpTexture2.size() ) ||
-                !ASSIMP_strincmp( pPtr, BumpTexture3.c_str(), BumpTexture3.size() ) ) {
+    } else if ( !ASSIMP_strincmp( pPtr, BumpTexture1.c_str(), static_cast<unsigned int>(BumpTexture1.size()) ) ||
+                !ASSIMP_strincmp( pPtr, BumpTexture2.c_str(), static_cast<unsigned int>(BumpTexture2.size()) ) ||
+                !ASSIMP_strincmp( pPtr, BumpTexture3.c_str(), static_cast<unsigned int>(BumpTexture3.size()) ) ) {
         // Bump texture
         out = & m_pModel->m_pCurrentMaterial->textureBump;
         clampIndex = ObjFile::Material::TextureBumpType;
-    } else if (!ASSIMP_strincmp( pPtr,NormalTexture.c_str(), NormalTexture.size())) {
+    } else if (!ASSIMP_strincmp( pPtr,NormalTexture.c_str(), static_cast<unsigned int>(NormalTexture.size()) ) ) {
         // Normal map
         out = & m_pModel->m_pCurrentMaterial->textureNormal;
         clampIndex = ObjFile::Material::TextureNormalType;
-    } else if(!ASSIMP_strincmp( pPtr, ReflectionTexture.c_str(), ReflectionTexture.size() ) ) {
+    } else if(!ASSIMP_strincmp( pPtr, ReflectionTexture.c_str(), static_cast<unsigned int>(ReflectionTexture.size()) ) ) {
         // Reflection texture(s)
         //Do nothing here
         return;
-    } else if (!ASSIMP_strincmp( pPtr, DisplacementTexture.c_str(), DisplacementTexture.size() ) ) {
+    } else if (!ASSIMP_strincmp( pPtr, DisplacementTexture.c_str(), static_cast<unsigned int>(DisplacementTexture.size()) ) ) {
         // Displacement texture
         out = &m_pModel->m_pCurrentMaterial->textureDisp;
         clampIndex = ObjFile::Material::TextureDispType;
-    } else if (!ASSIMP_strincmp( pPtr, SpecularityTexture.c_str(),SpecularityTexture.size() ) ) {
+    } else if (!ASSIMP_strincmp( pPtr, SpecularityTexture.c_str(), static_cast<unsigned int>(SpecularityTexture.size()) ) ) {
         // Specularity scaling (glossiness)
         out = & m_pModel->m_pCurrentMaterial->textureSpecularity;
         clampIndex = ObjFile::Material::TextureSpecularityType;
@@ -394,7 +394,7 @@ void ObjFileMtlImporter::getTextureOption(bool &clamp, int &clampIndex, aiString
         //skip option key and value
         int skipToken = 1;
 
-        if (!ASSIMP_strincmp(pPtr, ClampOption.c_str(), ClampOption.size()))
+        if (!ASSIMP_strincmp(pPtr, ClampOption.c_str(), static_cast<unsigned int>(ClampOption.size())))
         {
             DataArrayIt it = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
             char value[3];
@@ -406,7 +406,7 @@ void ObjFileMtlImporter::getTextureOption(bool &clamp, int &clampIndex, aiString
 
             skipToken = 2;
         }
-        else if( !ASSIMP_strincmp( pPtr, TypeOption.c_str(), TypeOption.size() ) )
+        else if( !ASSIMP_strincmp( pPtr, TypeOption.c_str(), static_cast<unsigned int>(TypeOption.size()) ) )
         {
             DataArrayIt it = getNextToken<DataArrayIt>( m_DataIt, m_DataItEnd );
             char value[ 12 ];
@@ -449,22 +449,22 @@ void ObjFileMtlImporter::getTextureOption(bool &clamp, int &clampIndex, aiString
 
             skipToken = 2;
         }
-        else if (!ASSIMP_strincmp(pPtr, BlendUOption.c_str(), BlendUOption.size())
-                || !ASSIMP_strincmp(pPtr, BlendVOption.c_str(), BlendVOption.size())
-                || !ASSIMP_strincmp(pPtr, BoostOption.c_str(), BoostOption.size())
-                || !ASSIMP_strincmp(pPtr, ResolutionOption.c_str(), ResolutionOption.size())
-                || !ASSIMP_strincmp(pPtr, BumpOption.c_str(), BumpOption.size())
-                || !ASSIMP_strincmp(pPtr, ChannelOption.c_str(), ChannelOption.size()))
+        else if (!ASSIMP_strincmp(pPtr, BlendUOption.c_str(), static_cast<unsigned int>(BlendUOption.size()))
+                || !ASSIMP_strincmp(pPtr, BlendVOption.c_str(), static_cast<unsigned int>(BlendVOption.size()))
+                || !ASSIMP_strincmp(pPtr, BoostOption.c_str(), static_cast<unsigned int>(BoostOption.size()))
+                || !ASSIMP_strincmp(pPtr, ResolutionOption.c_str(), static_cast<unsigned int>(ResolutionOption.size()))
+                || !ASSIMP_strincmp(pPtr, BumpOption.c_str(), static_cast<unsigned int>(BumpOption.size()))
+                || !ASSIMP_strincmp(pPtr, ChannelOption.c_str(), static_cast<unsigned int>(ChannelOption.size())))
         {
             skipToken = 2;
         }
-        else if (!ASSIMP_strincmp(pPtr, ModifyMapOption.c_str(), ModifyMapOption.size()))
+        else if (!ASSIMP_strincmp(pPtr, ModifyMapOption.c_str(), static_cast<unsigned int>(ModifyMapOption.size())))
         {
             skipToken = 3;
         }
-        else if (  !ASSIMP_strincmp(pPtr, OffsetOption.c_str(), OffsetOption.size())
-                || !ASSIMP_strincmp(pPtr, ScaleOption.c_str(), ScaleOption.size())
-                || !ASSIMP_strincmp(pPtr, TurbulenceOption.c_str(), TurbulenceOption.size())
+        else if (  !ASSIMP_strincmp(pPtr, OffsetOption.c_str(), static_cast<unsigned int>(OffsetOption.size()))
+                || !ASSIMP_strincmp(pPtr, ScaleOption.c_str(), static_cast<unsigned int>(ScaleOption.size()))
+                || !ASSIMP_strincmp(pPtr, TurbulenceOption.c_str(), static_cast<unsigned int>(TurbulenceOption.size()))
                 )
         {
             skipToken = 4;
diff --git a/code/ObjFileParser.cpp b/code/ObjFileParser.cpp
index 27e4b27c4..251d71627 100644
--- a/code/ObjFileParser.cpp
+++ b/code/ObjFileParser.cpp
@@ -104,7 +104,7 @@ void ObjFileParser::parseFile( IOStreamBuffer<char> &streamBuffer ) {
     // only update every 100KB or it'll be too slow
     const unsigned int updateProgressEveryBytes = 100 * 1024;
     unsigned int progressCounter = 0;
-    const unsigned int bytesToProcess = streamBuffer.size();
+    const unsigned int bytesToProcess = static_cast<unsigned int>(streamBuffer.size());
     const unsigned int progressTotal = 3 * bytesToProcess;
     const unsigned int progressOffset = bytesToProcess;
     unsigned int processed = 0;
@@ -118,7 +118,7 @@ void ObjFileParser::parseFile( IOStreamBuffer<char> &streamBuffer ) {
         // Handle progress reporting        
         const size_t filePos( streamBuffer.getFilePos() );
         if ( lastFilePos < filePos ) {
-            processed += filePos;
+            processed += static_cast<unsigned int>(filePos);
             lastFilePos = filePos;
             progressCounter++;
             m_progress->UpdateFileRead( progressOffset + processed * 2, progressTotal );
@@ -377,9 +377,9 @@ void ObjFileParser::getFace( aiPrimitiveType type ) {
     ObjFile::Face *face = new ObjFile::Face( type );
     bool hasNormal = false;
 
-    const int vSize = m_pModel->m_Vertices.size();
-    const int vtSize = m_pModel->m_TextureCoord.size();
-    const int vnSize = m_pModel->m_Normals.size();
+    const int vSize = static_cast<unsigned int>(m_pModel->m_Vertices.size());
+    const int vtSize = static_cast<unsigned int>(m_pModel->m_TextureCoord.size());
+    const int vnSize = static_cast<unsigned int>(m_pModel->m_Normals.size());
 
     const bool vt = (!m_pModel->m_TextureCoord.empty());
     const bool vn = (!m_pModel->m_Normals.empty());
@@ -771,7 +771,7 @@ void ObjFileParser::createMesh( const std::string &meshName )
     ai_assert( NULL != m_pModel );
     m_pModel->m_pCurrentMesh = new ObjFile::Mesh( meshName );
     m_pModel->m_Meshes.push_back( m_pModel->m_pCurrentMesh );
-    unsigned int meshId = m_pModel->m_Meshes.size()-1;
+    unsigned int meshId = static_cast<unsigned int>(m_pModel->m_Meshes.size()-1);
     if ( NULL != m_pModel->m_pCurrent )
     {
         m_pModel->m_pCurrent->m_Meshes.push_back( meshId );