diff --git a/doc/conf.py b/doc/conf.py
index 3563433ff9d..0390c443e15 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -6,11 +6,11 @@ import sphinx
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 DIR = os.path.dirname(__file__)
-sys.path.append(
+sys.path.insert(0,
     os.path.abspath(
         os.path.join(DIR, '_extensions')))
-# autodoc
-sys.path.append(os.path.abspath(os.path.join(DIR, '..')))
+# put current odoo's source on PYTHONPATH for autodoc
+sys.path.insert(0, os.path.abspath(os.path.join(DIR, '..')))
 
 # -- General configuration -----------------------------------------------------