diff --git a/headers/private/kernel/arch/x86/arch_cpu.h b/headers/private/kernel/arch/x86/arch_cpu.h
index a202d08f4a..abdbb862d6 100644
--- a/headers/private/kernel/arch/x86/arch_cpu.h
+++ b/headers/private/kernel/arch/x86/arch_cpu.h
@@ -82,6 +82,8 @@
 #define IA32_MSR_APIC_INITIAL_TIMER_COUNT	0x00000838
 #define IA32_MSR_APIC_CURRENT_TIMER_COUNT	0x00000839
 #define IA32_MSR_APIC_TIMER_DIVIDE_CONFIG	0x0000083e
+#define IA32_MSR_APIC_SELF_IPI				0x0000083f
+#define IA32_MSR_XSS						0x00000da0
 
 // x86_64 MSRs.
 #define IA32_MSR_STAR					0xc0000081