Index: test/std/strings/string.view/string.view.ops/copy.pass.cpp
===================================================================
--- test/std/strings/string.view/string.view.ops/copy.pass.cpp
+++ test/std/strings/string.view/string.view.ops/copy.pass.cpp
@@ -19,6 +19,7 @@
 
 
 #include <string_view>
+#include <algorithm>
 #include <cassert>
 
 #include "test_macros.h"