diff --git a/lib/ace/editor.js b/lib/ace/editor.js
index 6102864b..642cbac3 100644
--- a/lib/ace/editor.js
+++ b/lib/ace/editor.js
@@ -644,7 +644,7 @@ var Editor =function(renderer, session) {
         return this.$readOnly;
     };
 
-    this.$modeBehaviours = false;
+    this.$modeBehaviours = true;
     this.setBehavioursEnabled = function (enabled) {
         this.$modeBehaviours = enabled;
     }