diff --git a/docs/conf.py b/docs/conf.py
index ec416f1c19..dfee5aec0a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -112,7 +112,6 @@ templates_path = ['_templates']
 # You can specify multiple suffix as a list of string:
 #
 # source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
 
 # The master toctree document.
 master_doc = 'index'