diff --git a/test-requirements.txt b/test-requirements.txt
index 20b2dc96..72261d43 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -8,7 +8,7 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 pycrypto>=2.6 # Public Domain
 python-subunit>=1.0.0 # Apache-2.0/BSD
 python-swiftclient>=3.2.0 # Apache-2.0
-sphinx>=1.6.2 # BSD
+sphinx!=1.6.6,>=1.6.2 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0