diff --git a/Tests/test_image_toqimage.py b/Tests/test_image_toqimage.py
index 38b83c023..6c79b4c6d 100644
--- a/Tests/test_image_toqimage.py
+++ b/Tests/test_image_toqimage.py
@@ -19,7 +19,7 @@ class TestToQImage(PillowQtTestCase, PillowTestCase):
             self.assertFalse(data.isNull())
 
             # Test saving the file
-            tempfile = self.tempfile('temp_{}.png'.format(mode))
+            tempfile = self.tempfile('temp_{0}.png'.format(mode))
             data.save(tempfile)