diff --git a/lib/repository.js b/lib/repository.js
index 29c429fad..aa7c406e4 100644
--- a/lib/repository.js
+++ b/lib/repository.js
@@ -351,14 +351,12 @@ Repository.initExt = function(repo_path, opts) {
 
 Repository.getReferences = function(repo, type, refNamesOnly) {
   return repo.getReferences().then(function(refList) {
-    var filteredRefList = refList;
-
-    filteredRefList.filter(function(reference) {
-      return type == Reference.TYPE.LISTALL || reference.type === type;
+    var filteredRefList = refList.filter(function(reference) {
+      return type === Reference.TYPE.ALL || reference.type === type;
     });
 
     if (refNamesOnly) {
-      filteredRefList.map(function(reference) {
+      return filteredRefList.map(function(reference) {
         return reference.name();
       });
     }
@@ -1255,8 +1253,8 @@ Repository.prototype.getReferenceCommit = function(name, callback) {
  * @param {Reference.TYPE} type Type of reference to look up
  * @return {Array<String>}
  */
-Repository.prototype.getReferenceNames = function(type, callback) {
-  return Repository.getReferences(this, type, true, callback);
+Repository.prototype.getReferenceNames = function(type) {
+  return Repository.getReferences(this, type, true);
 };
 
 /**