diff --git a/deps/ox/src/ox/std/hashmap.hpp b/deps/ox/src/ox/std/hashmap.hpp
index 336598aac..e7393aa40 100644
--- a/deps/ox/src/ox/std/hashmap.hpp
+++ b/deps/ox/src/ox/std/hashmap.hpp
@@ -6,6 +6,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+#pragma once
+
 #include "string.hpp"
 #include "vector.hpp"