diff --git a/testing/acceptance_test.py b/testing/acceptance_test.py
index 7b74f158d..c7139b538 100644
--- a/testing/acceptance_test.py
+++ b/testing/acceptance_test.py
@@ -1302,6 +1302,4 @@ def test_function_return_non_none_warning(testdir) -> None:
     """
     )
     res = testdir.runpytest()
-    res.stdout.fnmatch_lines(
-        ["*Did you mean to use `assert` instead of `return`?*"]
-    )
+    res.stdout.fnmatch_lines(["*Did you mean to use `assert` instead of `return`?*"])