diff --git a/tests/filterpyflakes.py b/tests/filterpyflakes.py
index 1ce16c7b7fb4e0f92aca8f882767feaa464848bb_dGVzdHMvZmlsdGVycHlmbGFrZXMucHk=..0768cda8b5799dc803dc0ee27a832cd64e05f28a_dGVzdHMvZmlsdGVycHlmbGFrZXMucHk= 100755
--- a/tests/filterpyflakes.py
+++ b/tests/filterpyflakes.py
@@ -32,6 +32,7 @@
             r"imported but unused",
             r"local variable '.*' is assigned to but never used",
             r"unable to detect undefined names",
+            r"undefined name '.*'",
            ]
     for msgtype, pat in enumerate(pats):
         if re.search(pat, line):