diff --git a/Kernel/Arch/x86/Spinlock.h b/Kernel/Arch/x86/Spinlock.h
index aaca62c01b..9331e689ab 100644
--- a/Kernel/Arch/x86/Spinlock.h
+++ b/Kernel/Arch/x86/Spinlock.h
@@ -9,6 +9,9 @@
 #include <Kernel/Arch/Processor.h>
 #include <Kernel/Locking/LockRank.h>
 
+#include <AK/Platform.h>
+VALIDATE_IS_X86()
+
 namespace Kernel {
 
 class Spinlock {