diff --git a/code/ColladaExporter.cpp b/code/ColladaExporter.cpp
index 745975e5d..06604bc8e 100644
--- a/code/ColladaExporter.cpp
+++ b/code/ColladaExporter.cpp
@@ -866,8 +866,8 @@ void ColladaExporter::WriteController( size_t pIndex)
 
     std::vector<ai_real> bind_poses;
     bind_poses.reserve(mesh->mNumBones * 16);
-    for( size_t i = 0; i < mesh->mNumBones; ++i)
-        for( size_t j = 0; j < 4; ++j)
+    for(unsigned int i = 0; i < mesh->mNumBones; ++i)
+        for( unsigned int j = 0; j < 4; ++j)
             bind_poses.insert(bind_poses.end(), mesh->mBones[i]->mOffsetMatrix[j], mesh->mBones[i]->mOffsetMatrix[j] + 4);
 
     WriteFloatArray( idstr + "-skin-bind_poses", FloatType_Mat4x4, (const ai_real*) bind_poses.data(), bind_poses.size() / 16);
@@ -924,11 +924,11 @@ void ColladaExporter::WriteController( size_t pIndex)
 
     ai_uint weight_index = 0;
     std::vector<ai_int> joint_weight_indices(2 * joint_weight_indices_length, (ai_int)-1);
-    for( size_t i = 0; i < mesh->mNumBones; ++i)
-        for( size_t j = 0; j < mesh->mBones[i]->mNumWeights; ++j)
+    for( unsigned int i = 0; i < mesh->mNumBones; ++i)
+        for( unsigned j = 0; j < mesh->mBones[i]->mNumWeights; ++j)
         {
             unsigned int vId = mesh->mBones[i]->mWeights[j].mVertexId;
-            for( size_t k = 0; k < num_influences[vId]; ++k)
+            for( ai_uint k = 0; k < num_influences[vId]; ++k)
             {
                 if (joint_weight_indices[2 * (accum_influences[vId] + k)] == -1)
                 {
diff --git a/code/ColladaLoader.cpp b/code/ColladaLoader.cpp
index c68eb27c9..f7ef903f4 100644
--- a/code/ColladaLoader.cpp
+++ b/code/ColladaLoader.cpp
@@ -728,7 +728,7 @@ aiMesh* ColladaLoader::CreateMesh( const ColladaParser& pParser, const Collada::
                                 ? aiMorphingMethod_MORPH_RELATIVE
                                 : aiMorphingMethod_MORPH_NORMALIZED;
         dstMesh->mAnimMeshes = new aiAnimMesh*[animMeshes.size()];
-        dstMesh->mNumAnimMeshes = animMeshes.size();
+        dstMesh->mNumAnimMeshes = static_cast<unsigned int>(animMeshes.size());
         for (unsigned int i = 0; i < animMeshes.size(); i++)
             dstMesh->mAnimMeshes[i] = animMeshes.at(i);
     }
@@ -1377,9 +1377,9 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
         {
               aiNodeAnim* dstAnim = new aiNodeAnim;
               dstAnim->mNodeName = nodeName;
-              dstAnim->mNumPositionKeys = resultTrafos.size();
-              dstAnim->mNumRotationKeys= resultTrafos.size();
-              dstAnim->mNumScalingKeys = resultTrafos.size();
+              dstAnim->mNumPositionKeys = static_cast<unsigned int>(resultTrafos.size());
+              dstAnim->mNumRotationKeys = static_cast<unsigned int>(resultTrafos.size());
+              dstAnim->mNumScalingKeys = static_cast<unsigned int>(resultTrafos.size());
               dstAnim->mPositionKeys = new aiVectorKey[resultTrafos.size()];
               dstAnim->mRotationKeys = new aiQuatKey[resultTrafos.size()];
               dstAnim->mScalingKeys = new aiVectorKey[resultTrafos.size()];
@@ -1445,11 +1445,11 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
                     ++morphAnimChannelIndex;
                 }
 
-                morphAnim->mNumKeys = morphTimeValues.size();
+                morphAnim->mNumKeys = static_cast<unsigned int>(morphTimeValues.size());
                 morphAnim->mKeys = new aiMeshMorphKey[morphAnim->mNumKeys];
                 for (unsigned int key = 0; key < morphAnim->mNumKeys; key++)
                 {
-                    morphAnim->mKeys[key].mNumValuesAndWeights = morphChannels.size();
+                    morphAnim->mKeys[key].mNumValuesAndWeights = static_cast<unsigned int>(morphChannels.size());
                     morphAnim->mKeys[key].mValues = new unsigned int [morphChannels.size()];
                     morphAnim->mKeys[key].mWeights = new double [morphChannels.size()];
 
@@ -1470,13 +1470,13 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
     {
         aiAnimation* anim = new aiAnimation;
         anim->mName.Set( pName);
-        anim->mNumChannels = anims.size();
+        anim->mNumChannels = static_cast<unsigned int>(anims.size());
         if (anim->mNumChannels > 0)
         {
             anim->mChannels = new aiNodeAnim*[anims.size()];
             std::copy( anims.begin(), anims.end(), anim->mChannels);
         }
-        anim->mNumMorphMeshChannels = morphAnims.size();
+        anim->mNumMorphMeshChannels = static_cast<unsigned int>(morphAnims.size());
         if (anim->mNumMorphMeshChannels > 0)
         {
             anim->mMorphMeshChannels = new aiMeshMorphAnim*[anim->mNumMorphMeshChannels];