diff --git a/docs/source/conf.py b/docs/source/conf.py
index 1e8284d..4edf5c3 100755
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -32,7 +32,6 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = ['sphinx.ext.autodoc',
-              'sphinx.ext.viewcode',
               'sphinx.ext.viewcode']
 
 # The suffix(es) of source filenames.