diff --git a/tests/tkpanels/test_Placer.py b/tests/tkpanels/test_Placer.py
index 1a5072bf82..1cc146efeb 100644
--- a/tests/tkpanels/test_Placer.py
+++ b/tests/tkpanels/test_Placer.py
@@ -4,7 +4,7 @@ from direct.showbase.ShowBase import ShowBase
 from direct.tkpanels.Placer import Placer
 
 
-def test_Placer(window):
+def test_Placer(window, tk_toplevel):
     base = ShowBase()
     base.start_direct()
     root = Pmw.initialise()