diff --git a/tests/lib/pysol_tests/import_file1.py b/tests/lib/pysol_tests/import_file1.py
index 2e4d166b..432770a5 100644
--- a/tests/lib/pysol_tests/import_file1.py
+++ b/tests/lib/pysol_tests/import_file1.py
@@ -64,11 +64,11 @@ class MockGame:
         self.preview = 0
 
 
-def m1(*args):
-    return 1
+def _empty_override(*args):
+    return True
 
 
-pysollib.stack.MfxCanvasGroup = m1
+pysollib.stack.MfxCanvasGroup = _empty_override
 
 
 class Mock_S_Game: