diff --git a/lib/libspl/include/sys/systeminfo.h b/lib/libspl/include/sys/systeminfo.h
index 5d7e41c435..9f561aaa8a 100644
--- a/lib/libspl/include/sys/systeminfo.h
+++ b/lib/libspl/include/sys/systeminfo.h
@@ -27,6 +27,11 @@
 #ifndef _LIBSPL_SYS_SYSTEMINFO_H
 #define _LIBSPL_SYS_SYSTEMINFO_H
 
+#define HW_INVALID_HOSTID	0xFFFFFFFF	/* an invalid hostid */
+#define HW_HOSTID_LEN		11		/* minimum buffer size needed */
+						/* to hold a decimal or hex */
+						/* hostid string */
+
 #define sysinfo(cmd,buf,cnt)		(-1)
 
 #endif