1 files changed, 4 insertions, 0 deletions
diff --git a/lib/mapValuesLimit.js b/lib/mapValuesLimit.js
index bced034..f6e72ff 100644
--- a/lib/mapValuesLimit.js
+++ b/lib/mapValuesLimit.js
@@ -1,5 +1,8 @@
 import eachOfLimit from './eachOfLimit';
 
+import noop from 'lodash/noop';
+import once from './internal/once';
+
 /**
  * The same as [`mapValues`]{@link module:Collections.mapValues} but runs a maximum of `limit` async operations at a
  * time.
@@ -21,6 +24,7 @@ import eachOfLimit from './eachOfLimit';
  * transformed values from the `obj`. Invoked with (err, result).
  */
 export default function mapValuesLimit(obj, limit, iteratee, callback) {
+    callback = once(callback || noop);
     var newObj = {};
     eachOfLimit(obj, limit, function(val, key, next) {
         iteratee(val, key, function (err, result) {