diff --git a/std/algorithm.hpp b/std/algorithm.hpp
index eff073c930..2a60b83e61 100644
--- a/std/algorithm.hpp
+++ b/std/algorithm.hpp
@@ -23,6 +23,7 @@ using std::unique;
 using std::equal_range;
 using std::for_each;
 using std::copy;
+using std::remove_if;
 using std::replace;
 using std::reverse;
 using std::set_union;