diff --git a/tox.ini b/tox.ini
index 94e95948..f5c013f8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,5 +5,5 @@ envlist = py26,py27,py33,py34,py35,py36,py37
 deps =
     pytest
     unittest2
-    importlib
+    py26: importlib
 commands = pytest {posargs}