diff --git a/setup.cfg b/setup.cfg
index 19bd043..2389972 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ console_scripts =
 
 [extras]
 sphinx =
-  sphinx>=1.5.1  # BSD
+  sphinx>=1.5.1,!=1.6.1  # BSD
   docutils>=0.11  # OSI-Approved Open Source, Public Domain
 
 [build_sphinx]