diff --git a/usr.sbin/sysinstall/sysinstall.h b/usr.sbin/sysinstall/sysinstall.h
index a2a6e00f6132..d5f4b3288f47 100644
--- a/usr.sbin/sysinstall/sysinstall.h
+++ b/usr.sbin/sysinstall/sysinstall.h
@@ -130,7 +130,7 @@
 #define VAR_INSTALL_CFG			"installConfig"
 #define VAR_INSTALL_ROOT		"installRoot"
 #define VAR_IPADDR			"ipaddr"
-#define VAR_IPV6_ENABLE			"ipv6_enable"
+#define VAR_IPV6_ENABLE			"ipv6_activate_all_interfaces"
 #define VAR_IPV6ADDR			"ipv6addr"
 #define VAR_KERN_SECURELEVEL		"kern_securelevel"
 #define VAR_KEYMAP			"keymap"