diff --git a/test/functions.js b/test/functions.js
index fc50d2990..598bf6fb1 100644
--- a/test/functions.js
+++ b/test/functions.js
@@ -127,6 +127,18 @@
     });
     hashed('yep');
     deepEqual(hashed.cache, {'YEP': 'yep'}, 'takes a hasher');
+
+    // Test that the hash function can be used to swizzle the key.
+    var objCacher = _.memoize(function(value, key) {
+      return {key: key, value: value};
+    }, function(value, key) {
+      return key;
+    });
+    var myObj = objCacher('a', 'alpha');
+    var myObjAlias = objCacher('b', 'alpha');
+    notStrictEqual(myObj, undefined, 'object is created if second argument used as key');
+    strictEqual(myObj, myObjAlias, 'object is cached if second argument used as key');
+    strictEqual(myObj.value, 'a', 'object is not modified if second argument used as key');
   });
 
   asyncTest('delay', 2, function() {
diff --git a/underscore.js b/underscore.js
index c24c01d78..cd59b6cc1 100644
--- a/underscore.js
+++ b/underscore.js
@@ -709,7 +709,7 @@
       var cache = memoize.cache;
       var address = hasher ? hasher.apply(this, arguments) : key;
       if (!_.has(cache, address)) cache[address] = func.apply(this, arguments);
-      return cache[key];
+      return cache[address];
     };
     memoize.cache = {};
     return memoize;