diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 628aebf..c3239f6 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -1066,7 +1066,7 @@
 	connect_bsp_APIC();
 
 	phys_cpu_present_map = physid_mask_of_physid(boot_cpu_id);
-	apic_write_around(APIC_ID, boot_cpu_id);
+	apic_write_around(APIC_ID, SET_APIC_ID(boot_cpu_id));
 
 	setup_local_APIC();
 
diff --git a/include/asm-x86_64/apicdef.h b/include/asm-x86_64/apicdef.h
index fb1c99a..decaa2d 100644
--- a/include/asm-x86_64/apicdef.h
+++ b/include/asm-x86_64/apicdef.h
@@ -13,6 +13,7 @@
 #define		APIC_ID		0x20
 #define			APIC_ID_MASK		(0xFFu<<24)
 #define			GET_APIC_ID(x)		(((x)>>24)&0xFFu)
+#define			SET_APIC_ID(x)		(((x)<<24))
 #define		APIC_LVR	0x30
 #define			APIC_LVR_MASK		0xFF00FF
 #define			GET_APIC_VERSION(x)	((x)&0xFFu)