diff --git a/test-requirements.txt b/test-requirements.txt
index f1a98ed2..ca69e6c5 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -8,7 +8,7 @@ ddt>=1.0.1 # MIT
 django-nose>=1.4.4 # BSD
 reno>=1.8.0 # Apache-2.0
 mock>=2.0 # BSD
-mox3>=0.7.0 # Apache-2.0
+mox3!=0.19.0,>=0.7.0 # Apache-2.0
 netifaces>=0.10.4 # MIT
 nose-exclude # LGPL
 python-subunit>=0.0.18 # Apache-2.0/BSD