diff --git a/Tests/test_imageops.py b/Tests/test_imageops.py
index d4328261d..f17bfdd2f 100644
--- a/Tests/test_imageops.py
+++ b/Tests/test_imageops.py
@@ -351,12 +351,14 @@ def test_auto_contrast_mask_real_input():
 
         assert result_nomask != result
         assert_tuple_approx_equal(
-                ImageStat.Stat(result, mask=rect_mask).median,
-                [195, 202, 184],
-                threshold=2,
-                msg='autocontrast with mask pixel incorrect')
+            ImageStat.Stat(result, mask=rect_mask).median,
+            [195, 202, 184],
+            threshold=2,
+            msg="autocontrast with mask pixel incorrect",
+        )
         assert_tuple_approx_equal(
-                ImageStat.Stat(result_nomask).median,
-                [119, 106, 79],
-                threshold=2,
-                msg='autocontrast without mask pixel incorrect')
+            ImageStat.Stat(result_nomask).median,
+            [119, 106, 79],
+            threshold=2,
+            msg="autocontrast without mask pixel incorrect",
+        )