diff --git a/tox.ini b/tox.ini
index 5768de2..ec11219 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ envlist = py32,py33
 
 [testenv]
 deps =
+    coverage
     pytest
     pytest-cov
 commands = py.test --cov pydle --cov-config .coveragerc --cov-report term-missing .