diff --git a/lib/ace/lib/regexp.js b/lib/ace/lib/regexp.js
index 420109ee..99a8ae51 100644
--- a/lib/ace/lib/regexp.js
+++ b/lib/ace/lib/regexp.js
@@ -30,6 +30,9 @@ define(function(require, exports, module) {
             return !x.lastIndex;
         }();
 
+    if (compliantLastIndexIncrement && compliantExecNpcg)
+        return;
+
     //---------------------------------
     //  Overriden native methods
     //---------------------------------