diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 1d5cfabec2c..8455fbafcd6 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -522,7 +522,7 @@ html_template = """<!DOCTYPE html>
     </head>
     <body>
         <!--[if lte IE 8]>
-        <script src="http://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script>
+        <script src="//ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script>
         <script>CFInstall.check({mode: "overlay"});</script>
         <![endif]-->
     </body>
