diff --git a/sys/x86/include/apicvar.h b/sys/x86/include/apicvar.h
--- a/sys/x86/include/apicvar.h
+++ b/sys/x86/include/apicvar.h
@@ -77,7 +77,7 @@
 
 #define	xAPIC_MAX_APIC_ID	0xfe
 #define	xAPIC_ID_ALL		0xff
-#define	MAX_APIC_ID		0x200
+#define	MAX_APIC_ID		0x800
 #define	APIC_ID_ALL		0xffffffff
 
 #define	IOAPIC_MAX_ID		xAPIC_MAX_APIC_ID