diff --git a/tox.ini b/tox.ini
index b1d2b4d9c..10b7f0ffc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -152,7 +152,8 @@ deps =
     flake8-copyright==0.1
     mccabe==0.4.0
     pep8==1.7.0
-    pyflakes==1.2.0
+    # https://bugs.launchpad.net/pyflakes/+bug/1578051
+    pyflakes==1.1.0  # rq.filter: != 1.2.0
     flake8-string-format==0.2.1
     flake8-deprecated==1.0
     flake8-mock==0.2