diff --git a/test-requirements.txt b/test-requirements.txt
index 27ab09a..5f83eea 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,7 +5,7 @@ coverage>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 hacking<0.12,>=0.11.0 # Apache-2.0
 mock>=2.0 # BSD
-mox3>=0.7.0 # Apache-2.0
+mox3!=0.19.0,>=0.7.0 # Apache-2.0
 requests-mock>=1.1 # Apache-2.0
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 testrepository>=0.0.18 # Apache-2.0/BSD