diff --git a/Libraries/LibC/stdarg.h b/Libraries/LibC/stdarg.h
index 9689c75469..e2b0c48a41 100644
--- a/Libraries/LibC/stdarg.h
+++ b/Libraries/LibC/stdarg.h
@@ -26,7 +26,7 @@
 
 #pragma once
 
-#ifdef KERNEL
+#if defined(KERNEL) || defined(BOOTSTRAPPER)
 #    define __BEGIN_DECLS
 #    define __END_DECLS
 #else