diff --git a/setup.cfg b/setup.cfg
index 205e632..3bf5e39 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -78,6 +78,7 @@ python =
 
 [testenv]
 usedevelop = true
+extras = tests
 whitelist_externals = py.test
 commands = py.test
 deps=