diff --git a/src/include/rpc/rpc.h b/src/include/rpc/rpc.h
index 89b48ac3..90d9a45b 100644
--- a/src/include/rpc/rpc.h
+++ b/src/include/rpc/rpc.h
@@ -87,6 +87,9 @@ extern struct rpcent *getrpcbynumber	__P((int));
 extern struct rpcent *getrpcent		__P((void));
 extern void setrpcent __P((int));
 extern void endrpcent __P((void));
+
+extern int bindresvport __P((int, struct sockaddr_in *));
+
 __END_DECLS
 
 #endif /* !_RPC_RPC_H */