diff --git a/src/core/5.inject.js b/src/core/5.inject.js
index f4c28401d..f3d5f8627 100644
--- a/src/core/5.inject.js
+++ b/src/core/5.inject.js
@@ -479,7 +479,7 @@
                             }
                         }]);
                     } else {
-                        w.listeners[BI.Events.MOUNT] = (w.listeners[BI.Events.MOUNT] || []), concat([
+                        w.listeners[BI.Events.MOUNT] = (w.listeners[BI.Events.MOUNT] || []).concat([
                             function () {
                                 BI.Plugin.getObject(elType, this);
                             }