diff --git a/docs/source/conf.py b/docs/source/conf.py
index e609aabe14..eeecba23e4 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -54,8 +54,7 @@ extensions = ['sphinx.ext.autodoc',
               'sphinx.ext.intersphinx',
               'sphinx.ext.viewcode',
               'sphinx.ext.imgconverter',
-              'sphinx.ext.numfig',
-              #'sphinx_numfig',
+              'sphinx_numfig',
               'notebook_sphinxext']
 
 # Add any paths that contain templates here, relative to this directory.