diff --git a/fp/_mapping.js b/fp/_mapping.js
index cbbcd99df..8f5ddf2d0 100644
--- a/fp/_mapping.js
+++ b/fp/_mapping.js
@@ -167,7 +167,8 @@ exports.iterateeAry = {
 
 /** Used to map method names to iteratee rearg configs. */
 exports.iterateeRearg = {
-  'mapKeys': [1]
+  'mapKeys': [1],
+  'reduceRight': [1, 0]
 };
 
 /** Used to map method names to rearg configs. */
diff --git a/test/test-fp.js b/test/test-fp.js
index 312a3869d..46a4c87b1 100644
--- a/test/test-fp.js
+++ b/test/test-fp.js
@@ -1847,7 +1847,7 @@
         args || (args = slice.call(arguments));
       })(0)([1, 2, 3]);
 
-      assert.deepEqual(args, isReduce ? [0, 1] : [0, 3]);
+      assert.deepEqual(args, isReduce ? [0, 1] : [3, 0]);
     });
 
     QUnit.test('`fp.' + methodName + '` should provide the correct `iteratee` arguments when iterating an object', function(assert) {
@@ -1858,8 +1858,8 @@
           isFIFO = _.keys(object)[0] == 'a';
 
       var expected = isFIFO
-        ? (isReduce ? [0, 1] : [0, 2])
-        : (isReduce ? [0, 2] : [0, 1]);
+        ? (isReduce ? [0, 1] : [2, 0])
+        : (isReduce ? [0, 2] : [1, 0]);
 
       func(function() {
         args || (args = slice.call(arguments));