diff --git a/src/ngMessageFormat/messageFormatSelector.js b/src/ngMessageFormat/messageFormatSelector.js
index 6997354594f3..e49af526063a 100644
--- a/src/ngMessageFormat/messageFormatSelector.js
+++ b/src/ngMessageFormat/messageFormatSelector.js
@@ -24,6 +24,7 @@ function MessageSelectorBase(expressionFn, choices) {
   this.parsedFn['$$watchDelegate'] = function $$watchDelegate(scope, listener, objectEquality) {
     return self.watchDelegate(scope, listener, objectEquality);
   };
+  this.parsedFn.exp = expressionFn.exp;
 }
 
 MessageSelectorBase.prototype.getMessageFn = function getMessageFn(value) {