diff --git a/Kernel/Arch/x86/ProcessorInfo.h b/Kernel/Arch/x86/ProcessorInfo.h
index 8a559805229..fc21e026aff 100644
--- a/Kernel/Arch/x86/ProcessorInfo.h
+++ b/Kernel/Arch/x86/ProcessorInfo.h
@@ -9,6 +9,9 @@
 #include <AK/String.h>
 #include <AK/Types.h>
 
+#include <AK/Platform.h>
+VALIDATE_IS_X86()
+
 namespace Kernel {
 
 class Processor;