diff --git a/doc/source/conf.py b/doc/source/conf.py
index e805a98767..f4434ec154 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -100,7 +100,7 @@ exclude_patterns = []
 pygments_style = 'sphinx'
 
 # A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
+modindex_common_prefix = ['openstackclient.']
 
 
 # -- Options for HTML output --------------------------------------------------