diff --git a/backend/test_pp.py b/backend/test_pp.py
index faabc41..3cfa0fd 100644
--- a/backend/test_pp.py
+++ b/backend/test_pp.py
@@ -69,7 +69,7 @@ class TestPostProcessorsOnFakeData(TestCase):
             if ret != 0:
                 raise RuntimeError(f'FFmpeg returned {ret} exit code')
         except Exception as err:
-            self.skipTest(f'Error while writing empty MP3: {err:r}')
+            self.skipTest(f'Error while writing empty MP3: {err!r}')
 
         id3pp.ID3TagsPP().run(INFO_AFTER)