diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index 675a739e6a9c..3d1d44a38d15 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -1022,7 +1022,7 @@ def tk_window_focus():
     'matplotlib.tests.test_text',
     'matplotlib.tests.test_ticker',
     'matplotlib.tests.test_tightlayout',
-    'matplotlib.tests.test_triangulation'
+    'matplotlib.tests.test_triangulation',
     'matplotlib.tests.test_transforms',
     ]