diff --git a/tox.ini b/tox.ini
index 371027d..fe5b375 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 minversion = 1.6
 envlist =
-    py26,py27,py32,py33,py34
+    py25,py26,py27,py32,py33,py34,py27-flake8,py34-flake8
 
 [testenv]
 usedevelop = True
@@ -10,6 +10,18 @@ commands =
     python setup.py test -q
     python setup.py flake8
 
+[testenv:py27-flake8]
+basepython = python2.7
+deps =
+    flake8
+commands = flake8 {posargs} flake8/
+
+[testenv:py34-flake8]
+basepython = python3.4
+deps =
+    flake8
+commands = flake8 {posargs} flake8/
+
 [flake8]
 select = E,F,W
 max_line_length = 79