diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h
index 712b54b8f28..f1cd14e27e2 100644
--- a/sys/amd64/include/vmparam.h
+++ b/sys/amd64/include/vmparam.h
@@ -158,7 +158,7 @@
 #define	DMAP_MIN_ADDRESS	KVADDR(DMPML4I, 0, 0, 0)
 #define	DMAP_MAX_ADDRESS	KVADDR(DMPML4I+1, 0, 0, 0)
 
-#define	KERNBASE		KVADDR(KPML4I, KPDPI, 0, 0)
+#define	KERNBASE		MAX(0xffffffff80000000ul, VM_MIN_KERNEL_ADDRESS)
 
 #define	UPT_MAX_ADDRESS		KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
 #define	UPT_MIN_ADDRESS		KVADDR(PML4PML4I, 0, 0, 0)