diff --git a/include/algorithm b/include/algorithm
index b90f33c..55ea5eb 100644
--- a/include/algorithm
+++ b/include/algorithm
@@ -4382,7 +4382,7 @@
 {
     typedef typename iterator_traits<_InputIterator1>::value_type __v1;
     typedef typename iterator_traits<_InputIterator2>::value_type __v2;
-    return merge(__first1, __last1, __first2, __last2, __result, __less<__v1, __v2>());
+    return _VSTD::merge(__first1, __last1, __first2, __last2, __result, __less<__v1, __v2>());
 }
 
 // inplace_merge