diff --git a/doc/source/conf.py b/doc/source/conf.py
index c995ac665..56e669b57 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -44,7 +44,6 @@ sys.path = [os.path.abspath('../../muranodashboard'),
 extensions = ['sphinx.ext.autodoc',
               'sphinx.ext.intersphinx',
               'sphinx.ext.coverage',
-              'sphinx.ext.pngmath',
               'sphinx.ext.ifconfig',
               'sphinx.ext.graphviz']