diff --git a/lib/matplotlib/tests/test_coding_standards.py b/lib/matplotlib/tests/test_coding_standards.py
index 26154add17ab..3c63cd0c4a24 100644
--- a/lib/matplotlib/tests/test_coding_standards.py
+++ b/lib/matplotlib/tests/test_coding_standards.py
@@ -35,7 +35,8 @@
                  '_gtkagg.py',
                  '_backend_gdk.py',
                  'pyparsing*',
-                 '_qhull.py']
+                 '_qhull.py',
+                 '_macosx.py']
 
 PEP8_ADDITIONAL_IGNORE = ['E111',
                           'E112',