diff --git a/tox.ini b/tox.ini
index 15442991e..ba500a2a0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,8 +5,8 @@ addopts=--tb=short
 envlist =
        py27-{lint,docs},
        {py27,py32,py33,py34,py35}-django18,
-       {py27,py34,py35}-django{19}
-       {py27,py34,py35}-django{110}
+       {py27,py34,py35}-django19,
+       {py27,py34,py35}-django110
 
 [testenv]
 commands = ./runtests.py --fast {posargs} --coverage -rw
@@ -19,6 +19,12 @@ deps =
         django110: Django==1.10a1
         -rrequirements/requirements-testing.txt
         -rrequirements/requirements-optionals.txt
+basepython =
+    py35: python3.5
+    py34: python3.4
+    py33: python3.3
+    py32: python3.2
+    py27: python2.7
 
 [testenv:py27-lint]
 commands = ./runtests.py --lintonly