diff --git a/web_dialog_size/static/src/js/web_dialog_size.js b/web_dialog_size/static/src/js/web_dialog_size.js
index e83bbcea5..63b6af62b 100644
--- a/web_dialog_size/static/src/js/web_dialog_size.js
+++ b/web_dialog_size/static/src/js/web_dialog_size.js
@@ -16,7 +16,7 @@ Dialog.include({
         return this._super.apply(this, arguments).then(function () {
             self.$modal.find('.dialog_button_extend').on('click', self.proxy('_extending'));
             self.$modal.find('.dialog_button_restore').on('click', self.proxy('_restore'));
-            return (function(r) {
+            return config.then(function(r) {
                 if (r.default_maximize) {
                     self._extending();
                 } else {