diff --git a/testing/test_config.py b/testing/test_config.py
index bf388c729..a01568608 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -1465,7 +1465,7 @@ class TestPytestPluginsVariable:
                     warnings.filterwarnings('always', category=DeprecationWarning)
                     pytest_plugins=['capture']
                     """,
-            }
+            },
         )
         res = testdir.runpytest_subprocess()
         assert res.ret == 0