diff --git a/AK/NoAllocationGuard.h b/AK/NoAllocationGuard.h
index a809e68b69..27289a7bd6 100644
--- a/AK/NoAllocationGuard.h
+++ b/AK/NoAllocationGuard.h
@@ -12,8 +12,8 @@
 #if defined(KERNEL)
 #    include <Kernel/Arch/Processor.h>
 #    include <Kernel/Heap/kmalloc.h>
-#else
-#    include <LibC/mallocdefs.h>
+#elif defined(AK_OS_SERENITY)
+#    include <mallocdefs.h>
 #endif
 
 namespace AK {