diff --git a/tox.ini b/tox.ini
index 8efcba6..1ae06ef 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,3 +1,6 @@
+[tox]
+minversion = 2.4
+
 [testenv]
 commands = py.test {posargs}
 usedevelop = True