diff --git a/direct/src/showbase/Sources.pp b/direct/src/showbase/Sources.pp
index 4076ce2f8a..a822c64c33 100644
--- a/direct/src/showbase/Sources.pp
+++ b/direct/src/showbase/Sources.pp
@@ -6,7 +6,7 @@
     linmath:c putil:c panda:m express:c pandaexpress:m dtoolconfig dtool
 
   #define SOURCES \
-    showBase.cxx showBase.h mersenne.cxx mersenne.h projectionScreen.h projectionScreen.I projectionScreen.cxx
+    showBase.cxx showBase.h mersenne.cxx mersenne.h
 
   #define IGATESCAN all
 #end lib_target