diff --git a/addons/auth_oauth/static/src/js/auth_oauth.js b/addons/auth_oauth/static/src/js/auth_oauth.js
index c63a51ba83a..fdf7baf607c 100644
--- a/addons/auth_oauth/static/src/js/auth_oauth.js
+++ b/addons/auth_oauth/static/src/js/auth_oauth.js
@@ -33,9 +33,7 @@ openerp.auth_oauth = function(instance) {
             this.$(".oe_login_pane form ul").after(buttons);
         },
         on_oauth_sign_in: function(ev) {
-            if (ev) {
-                ev.preventDefault();
-            }
+            ev.preventDefault();
             var index = $(ev.target).data('index');
             var provider = this.oauth_providers[index];
             var return_url = _.str.sprintf('%s//%s/auth_oauth/signin', location.protocol, location.host);