diff --git a/js/zoom.js b/js/zoom.js
index b2c38f0..7667a30 100755
--- a/js/zoom.js
+++ b/js/zoom.js
@@ -218,6 +218,9 @@
     }
   }
 
-  new ZoomService().listen()
+  // wait for dom ready (incase script included before body)
+  $(function () {
+    new ZoomService().listen()
+  })
 
 }(jQuery)