diff --git a/src/include/rpcsvc/ypclnt.h b/src/include/rpcsvc/ypclnt.h
index dcdfce48..e9efeeda 100644
--- a/src/include/rpcsvc/ypclnt.h
+++ b/src/include/rpcsvc/ypclnt.h
@@ -83,6 +83,7 @@ int	yp_all		__P((const char *, const char *,
 			     struct ypall_callback *));
 char *	yperr_string	__P((int));
 int	ypprot_err	__P((unsigned int));
+int	yp_maplist	__P((const char *, struct ypmaplist **));
 __END_DECLS
 
 #endif /* _RPCSVC_YPCLNT_H_ */