diff --git a/src/ace/KeyBinding.js b/src/ace/KeyBinding.js
index 3779e01c..cbd939c7 100644
--- a/src/ace/KeyBinding.js
+++ b/src/ace/KeyBinding.js
@@ -56,6 +56,8 @@ ace.KeyBinding = function(element, editor, config) {
         this.config = config || ace.isMac 
             ? ace.KeyBinding.default_mac
             : ace.KeyBinding.default_win;
+        if (typeof this.config.reverse == "undefined")
+            this.config.reverse = ace.objectReverse(this.config, "|");
     };
 
     this["selectall"] = function() {
diff --git a/src/ace/conf/keybindings/default_mac.js b/src/ace/conf/keybindings/default_mac.js
index 427ee106..6a6e6f7e 100644
--- a/src/ace/conf/keybindings/default_mac.js
+++ b/src/ace/conf/keybindings/default_mac.js
@@ -47,5 +47,3 @@ ace.KeyBinding.default_mac = {
     "outdent": "Shift-Tab",
     "indent": "Tab"
 };
-
-ace.KeyBinding.default_mac.reverse = ace.objectReverse(ace.KeyBinding.default_mac, "|");
diff --git a/src/ace/conf/keybindings/default_win.js b/src/ace/conf/keybindings/default_win.js
index 1111f685..78c77a8d 100644
--- a/src/ace/conf/keybindings/default_win.js
+++ b/src/ace/conf/keybindings/default_win.js
@@ -47,5 +47,3 @@ ace.KeyBinding.default_win = {
     "outdent": "Shift-Tab",
     "indent": "Tab"
 };
-
-ace.KeyBinding.default_win.reverse = ace.objectReverse(ace.KeyBinding.default_win, "|");