diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index ac7002a98..3f0b69670 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -463,7 +463,7 @@ ADD_ASSIMP_IMPORTER( IFC
   STEPFileEncoding.h
 )
 if (MSVC AND ASSIMP_BUILD_IFC_IMPORTER)
-  set_source_files_properties(IFCReaderGen.cpp PROPERTIES COMPILE_FLAGS "/bigobj")
+  set_source_files_properties(IFCReaderGen1.cpp IFCReaderGen2.cpp PROPERTIES COMPILE_FLAGS "/bigobj")
 endif (MSVC AND ASSIMP_BUILD_IFC_IMPORTER)
 
 ADD_ASSIMP_IMPORTER( XGL