diff --git a/src/bun.js/modules/ObjectModule.h b/src/bun.js/modules/ObjectModule.h
index 27a3574621..7a782a4074 100644
--- a/src/bun.js/modules/ObjectModule.h
+++ b/src/bun.js/modules/ObjectModule.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include "../bindings/ZigGlobalObject.h"
 #include "JavaScriptCore/JSGlobalObject.h"