diff --git a/src/Mod/Machining_Distortion/CMakeLists.txt b/src/Mod/Machining_Distortion/CMakeLists.txt
index 5dc518f21..9f3008583 100755
--- a/src/Mod/Machining_Distortion/CMakeLists.txt
+++ b/src/Mod/Machining_Distortion/CMakeLists.txt
@@ -1,4 +1,7 @@
 
+
+# collect all the python files:
+#FILE( GLOB MachDist_SRCS ./*.py  )
 SET(MachDist_SRCS
     Init.py
     InitGui.py
@@ -12,6 +15,7 @@ SET(MachDist_SRCS
 	MachiningDistortionCommands.py
 	User_Interface_Mach_Dist.py
 	machdist_rc.py
+	MachDistMaterial.py
     
 )
 SOURCE_GROUP("" FILES ${MachDist_SRCS})