diff --git a/test-requirements.txt b/test-requirements.txt
index 2607ae5..b532d3d 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,7 +10,7 @@ hacking<0.11,>=0.10.2 # Apache-2.0
 coverage>=4.0 # Apache-2.0
 django-nose>=1.4.4 # BSD
 mock>=2.0 # BSD
-mox3>=0.7.0 # Apache-2.0
+mox3!=0.19.0,>=0.7.0 # Apache-2.0
 nose-exclude # LGPL
 python-subunit>=0.0.18 # Apache-2.0/BSD
 selenium>=2.50.1 # Apache-2.0