diff --git a/Kernel/Arch/x86/Processor.h b/Kernel/Arch/x86/Processor.h
index a099b46f80..9f3c974b6a 100644
--- a/Kernel/Arch/x86/Processor.h
+++ b/Kernel/Arch/x86/Processor.h
@@ -18,6 +18,9 @@
 #include <Kernel/Arch/x86/TSS.h>
 #include <Kernel/Forward.h>
 
+#include <AK/Platform.h>
+VALIDATE_IS_X86()
+
 namespace Kernel {
 
 class ProcessorInfo;