diff --git a/code/DropFaceNormalsProcess.cpp b/code/DropFaceNormalsProcess.cpp
index 3800fee0b..57e8b972b 100644
--- a/code/DropFaceNormalsProcess.cpp
+++ b/code/DropFaceNormalsProcess.cpp
@@ -104,5 +104,6 @@ bool DropFaceNormalsProcess::DropMeshFaceNormals (aiMesh* pMesh) {
     }
     
     delete[] pMesh->mNormals;
+    pMesh->mNormals = nullptr;
     return true;
 }
diff --git a/code/PostStepRegistry.cpp b/code/PostStepRegistry.cpp
index a04092d3a..646aeaeb0 100644
--- a/code/PostStepRegistry.cpp
+++ b/code/PostStepRegistry.cpp
@@ -203,6 +203,9 @@ void GetPostProcessingStepInstanceList(std::vector< BaseProcess* >& out)
 #if (!defined ASSIMP_BUILD_NO_SPLITLARGEMESHES_PROCESS)
     out.push_back( new SplitLargeMeshesProcess_Triangle());
 #endif
+#if (!defined ASSIMP_BUILD_NO_GENFACENORMALS_PROCESS)
+    out.push_back( new DropFaceNormalsProcess());
+#endif
 #if (!defined ASSIMP_BUILD_NO_GENFACENORMALS_PROCESS)
     out.push_back( new GenFaceNormalsProcess());
 #endif
diff --git a/include/assimp/Compiler/pushpack1.h b/include/assimp/Compiler/pushpack1.h
index 94ee1e474..4c9fbb857 100644
--- a/include/assimp/Compiler/pushpack1.h
+++ b/include/assimp/Compiler/pushpack1.h
@@ -25,7 +25,7 @@
 #if defined(_MSC_VER) ||  defined(__BORLANDC__) ||	defined (__BCPLUSPLUS__)
 #	pragma pack(push,1)
 #	define PACK_STRUCT
-#elif defined( __GNUC__ )
+#elif defined( __GNUC__ ) || defined(__clang__)
 #	if !defined(HOST_MINGW)
 #		define PACK_STRUCT	__attribute__((__packed__))
 #	else