diff --git a/Tests/test_imagegrab.py b/Tests/test_imagegrab.py
index 2b4aa8d67..7d156d498 100644
--- a/Tests/test_imagegrab.py
+++ b/Tests/test_imagegrab.py
@@ -1,4 +1,4 @@
-from helper import unittest, PillowTestCase, onAppveyor
+from helper import unittest, PillowTestCase, on_appveyor
 
 import sys