diff --git a/deps/ox/src/ox/std/initializerlist.hpp b/deps/ox/src/ox/std/initializerlist.hpp
index a55f5f48..bc6c5715 100644
--- a/deps/ox/src/ox/std/initializerlist.hpp
+++ b/deps/ox/src/ox/std/initializerlist.hpp
@@ -6,6 +6,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+#pragma once
+
 #if __has_include(<initializer_list>)
 #include <initializer_list>
 #else