diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index 44c1ebe09..1b6f2f0fb 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -394,14 +394,15 @@ ADD_ASSIMP_IMPORTER( LWS
   AssetLib/LWS/LWSLoader.h
 )
 
-ADD_ASSIMP_IMPORTER( M3D
-  AssetLib/M3D/M3DMaterials.h
-  AssetLib/M3D/M3DImporter.h
-  AssetLib/M3D/M3DImporter.cpp
-  AssetLib/M3D/M3DWrapper.h
-  AssetLib/M3D/M3DWrapper.cpp
-  AssetLib/M3D/m3d.h
-)
+# Disabled for 5.1
+#ADD_ASSIMP_IMPORTER( M3D
+#  AssetLib/M3D/M3DMaterials.h
+#  AssetLib/M3D/M3DImporter.h
+#  AssetLib/M3D/M3DImporter.cpp
+#  AssetLib/M3D/M3DWrapper.h
+#  AssetLib/M3D/M3DWrapper.cpp
+#  AssetLib/M3D/m3d.h
+#)
 
 ADD_ASSIMP_IMPORTER( MD2
   AssetLib/MD2/MD2FileData.h