diff --git a/setup.py b/setup.py
index fb1fefb..8b4e493 100644
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,8 @@
             'lxml',
             'defusedxml',
             'pytest',
-            'sphinxcontrib-applehelp<1.0.1'
+            'sphinxcontrib-applehelp<1.0.1',
+            'sphinxcontrib.devhelp<1.0.1'
         ],
     },
     namespace_packages=['sphinxcontrib'],