diff --git a/Tests/test_file_apng.py b/Tests/test_file_apng.py
index d624bbb849c..eeac164ce73 100644
--- a/Tests/test_file_apng.py
+++ b/Tests/test_file_apng.py
@@ -337,9 +337,9 @@ def open():
         "sequence_fdat_fctl.png",
     ),
 )
-def test_apng_sequence_errors(f):
+def test_apng_sequence_errors(test_file):
     with pytest.raises(SyntaxError):
-        with Image.open(f"Tests/images/apng/{f}") as im:
+        with Image.open(f"Tests/images/apng/{test_file}") as im:
             im.seek(im.n_frames - 1)
             im.load()