diff --git a/lib/ace/ext/static_highlight.js b/lib/ace/ext/static_highlight.js
index a3461424..1d69a9bb 100644
--- a/lib/ace/ext/static_highlight.js
+++ b/lib/ace/ext/static_highlight.js
@@ -100,7 +100,7 @@ var highlight = function(el, opts, callback) {
  */
 
 highlight.render = function(input, mode, theme, lineStart, disableGutter, callback) {
-    var waiting = 0;
+    var waiting = 1;
     var modeCache = EditSession.prototype.$modes;
 
     // if either the theme or the mode were specified as objects
@@ -127,7 +127,7 @@ highlight.render = function(input, mode, theme, lineStart, disableGutter, callba
         var result = highlight.renderSync(input, mode, theme, lineStart, disableGutter);
         return callback ? callback(result) : result;
     }
-    return waiting || done();
+    return --waiting || done();
 };
 
 /*