diff --git a/direct/src/p3d/thirdparty.pdef b/direct/src/p3d/thirdparty.pdef
index 72e8636048..aaa7820033 100644
--- a/direct/src/p3d/thirdparty.pdef
+++ b/direct/src/p3d/thirdparty.pdef
@@ -13,6 +13,7 @@
 
 # Also see panda3d.pdef.
 
+from pandac.PandaModules import Filename
 import sys
 
 class wx(package):