diff --git a/overviewer_core/data/js_src/util.js b/overviewer_core/data/js_src/util.js
index 5a05ec8..e487b05 100644
--- a/overviewer_core/data/js_src/util.js
+++ b/overviewer_core/data/js_src/util.js
@@ -1,4 +1,9 @@
 overviewer.util = {
+	
+    // vars for callback
+    readyQueue: [],
+    isReady: false,
+	
     /* fuzz tester!
      */
     'testMaths': function(t) {