diff --git a/Kernel/Arch/x86/MSR.h b/Kernel/Arch/x86/MSR.h
index 4638b81c59..1acc1dfb41 100644
--- a/Kernel/Arch/x86/MSR.h
+++ b/Kernel/Arch/x86/MSR.h
@@ -10,6 +10,9 @@
 
 #include <Kernel/Arch/x86/CPUID.h>
 
+#include <AK/Platform.h>
+VALIDATE_IS_X86()
+
 namespace Kernel {
 
 class MSR {