diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index fc84bea..12e9d6c 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -1051,7 +1051,7 @@
 
 	connect_bsp_APIC();
 
-	phys_cpu_present_map = physid_mask_of_physid(0);
+	phys_cpu_present_map = physid_mask_of_physid(boot_cpu_id);
 	apic_write_around(APIC_ID, boot_cpu_id);
 
 	setup_local_APIC();