diff --git a/Tests/test_file_gribstub.py b/Tests/test_file_gribstub.py
index 80e141503..dc0fa22d7 100644
--- a/Tests/test_file_gribstub.py
+++ b/Tests/test_file_gribstub.py
@@ -32,7 +32,7 @@ class TestFileGribStub(PillowTestCase):
         im = Image.open(TEST_FILE)
 
         # Act / Assert: stub cannot load without an implemented handler
-        self.assertRaises(IOError, lambda: im.load())
+        self.assertRaises(IOError, im.load)
 
     def test_save(self):
         # Arrange