diff --git a/Tests/test_file_avif.py b/Tests/test_file_avif.py
index 7ccbb112cd0..652dfb0dad7 100644
--- a/Tests/test_file_avif.py
+++ b/Tests/test_file_avif.py
@@ -78,7 +78,7 @@ def skip_unless_avif_version_gte(version):
         should_skip = True
     else:
         version_str = ".".join([str(v) for v in version])
-        reason = "%s < %s" % (_avif.libavif_version, version_str)
+        reason = "{} < {}".format(_avif.libavif_version, version_str)
         should_skip = _avif.VERSION < version
     return pytest.mark.skipif(should_skip, reason=reason)