diff --git a/lodash.js b/lodash.js
index 21cdd992b..bc3ad2edd 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1508,6 +1508,8 @@
         if (result === null) {
           isDeep = false;
           result = {};
+        } else if (isDeep) {
+          isDeep = toString.call(result) == objectClass;
         }
       }
       if (!isDeep || result === value) {
diff --git a/test/test.js b/test/test.js
index 14c1bc4b7..df5d1f800 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1643,7 +1643,6 @@
       _.forOwn(objects, function(object, key) {
         test('`_.' + methodName + '` should clone ' + key, 2, function() {
           var actual = func(object);
-
           ok(_.isEqual(actual, object));
 
           if (_.isObject(object)) {
@@ -1656,7 +1655,7 @@
 
       _.forOwn(nonCloneable, function(object, key) {
         test('`_.' + methodName + '` should not clone ' + key, 1, function() {
-          deepEqual(func(object), {});
+          deepEqual(func(object), object && {});
         });
       });