diff --git a/sys/sun4v/include/vmparam.h b/sys/sun4v/include/vmparam.h
index 61d4937f9b2e..bd133e8ece2e 100644
--- a/sys/sun4v/include/vmparam.h
+++ b/sys/sun4v/include/vmparam.h
@@ -40,7 +40,6 @@
  * $FreeBSD$
  */
 
-
 #ifndef	_MACHINE_VMPARAM_H_
 #define	_MACHINE_VMPARAM_H_
 
@@ -203,6 +202,7 @@
 #define	VM_MAXUSER_ADDRESS	(VM_MAX_USER_ADDRESS)
 
 #define	KERNBASE		(VM_MIN_KERNEL_ADDRESS)
+#define	PROMBASE		(VM_MIN_PROM_ADDRESS)
 #define	USRSTACK		(VM_MAX_USER_ADDRESS)
 
 /*