diff --git a/zebra/rtadv.h b/zebra/rtadv.h
index d52c2c0..c2855a3 100644
--- a/zebra/rtadv.h
+++ b/zebra/rtadv.h
@@ -52,7 +52,8 @@
 
 };
 
-void rtadv_config_write (struct vty *, struct interface *);
+extern void rtadv_config_write (struct vty *, struct interface *);
+extern void rtadv_init (void);
 
 /* draft-ietf-mip6-mipext-advapi-03 */