diff --git a/tox.ini b/tox.ini
index b8ee702e4..e10012e05 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,7 +30,7 @@ deps =
     django==1.3.1
     cssselect==0.9.1
     mock==1.0.1
-    mitmproxy=0.9.2
+    mitmproxy==0.9.2
 
 [testenv:trunk]
 basepython = python2.7