diff --git a/direct/src/showutil/packp3d.py b/direct/src/showutil/packp3d.py
index a9cf73230a..250a904e3b 100755
--- a/direct/src/showutil/packp3d.py
+++ b/direct/src/showutil/packp3d.py
@@ -125,7 +125,7 @@ def makePackedApp(args):
         packager.require(requireName)
         
     packager.dir(root)
-    packager.mainModule(mainModule, filename = main)
+    packager.mainModule(mainModule)
         
     packager.endPackage(appBase, p3dApplication = True)