diff --git a/panda/src/pgraph/Sources.pp b/panda/src/pgraph/Sources.pp
index 883d21eacc..b7b18d4d29 100644
--- a/panda/src/pgraph/Sources.pp
+++ b/panda/src/pgraph/Sources.pp
@@ -3,6 +3,7 @@
 #define LOCAL_LIBS \
     lerp event gsgbase gobj putil linmath \
     downloader express pandabase pstatclient 
+#define USE_PACKAGES python
  
 #begin lib_target
   #define TARGET pgraph