diff --git a/doc/sources/conf.py b/doc/sources/conf.py
index 892c1054e..494e64eca 100644
--- a/doc/sources/conf.py
+++ b/doc/sources/conf.py
@@ -16,7 +16,7 @@ import sys, os
 # If your extensions are in another directory, add it here. If the directory
 # is relative to the documentation root, use os.path.abspath to make it
 # absolute, like shown here.
-sys.path.append(os.path.abspath('sphinxext'))
+sys.path.insert(0, os.path.abspath('sphinxext'))
 
 # General configuration
 # ---------------------