diff --git a/Kernel/Arch/x86/CPUID.h b/Kernel/Arch/x86/CPUID.h
index 324d204469..29eecd28d4 100644
--- a/Kernel/Arch/x86/CPUID.h
+++ b/Kernel/Arch/x86/CPUID.h
@@ -8,6 +8,9 @@
 
 #include <AK/Types.h>
 
+#include <AK/Platform.h>
+VALIDATE_IS_X86()
+
 namespace Kernel {
 
 class CPUID {