diff --git a/test-requirements.txt b/test-requirements.txt
index f93050c62..00fbe1a54 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,5 @@
 coverage>=3.6
+discover
 hacking>=0.8.0,<0.9
 mock>=1.0
 testrepository>=0.0.17