diff --git a/doc/source/conf.py b/doc/source/conf.py
index c09fb3aed25139354919653b50893420b1548173..5b644945347b99abc22429eb002a4553060ce70f 100755
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -40,7 +40,6 @@ extensions = ['matplotlib.sphinxext.only_directives',
               'sphinx.ext.coverage',
               'sphinx.ext.mathjax',
               'sphinx.ext.viewcode',
-              'sphinxarg.ext',
               'sphinx.ext.inheritance_diagram']
 
 # Add any paths that contain templates here, relative to this directory.