diff --git a/tox.ini b/tox.ini
index ec7a3c2b9c40..faececa3682b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,6 +2,14 @@
 envlist =
     py26,py27,cover,docs,lint
 
+[testenv:py26]
+commands =
+    nosetests
+deps =
+    nose
+    unittest2
+    protobuf==2.6.0
+
 [testenv]
 commands =
     nosetests