diff --git a/src/ox/std/test/byteswap_test.cpp b/src/ox/std/test/byteswap_test.cpp
index 096739f2a..6bad03536 100644
--- a/src/ox/std/test/byteswap_test.cpp
+++ b/src/ox/std/test/byteswap_test.cpp
@@ -6,6 +6,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 #include <map>
+#include <string>
 #include <ox/std/std.hpp>
 
 using namespace std;