diff --git a/sys/arch/macppc/dev/am79c950.c b/sys/arch/macppc/dev/am79c950.c
index 83efe7c64c2e..edcdf80b57a9 100644
--- a/sys/arch/macppc/dev/am79c950.c
+++ b/sys/arch/macppc/dev/am79c950.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: am79c950.c,v 1.5 1998/07/05 06:49:06 jonathan Exp $	*/
+/*	$NetBSD: am79c950.c,v 1.6 1998/09/03 14:06:06 tsubai Exp $	*/
 
 /*-
  * Copyright (c) 1997 David Huang <khym@bga.com>
@@ -502,7 +502,7 @@ maceput(sc, m)
 	return (totlen);
 }
 
-void
+int
 mcintr(arg)
 	void *arg;
 {
@@ -510,6 +510,9 @@ mcintr(arg)
 	u_int8_t ir;
 
 	ir = NIC_GET(sc, MACE_IR) & ~NIC_GET(sc, MACE_IMR);
+	if (ir == 0)
+		return 0;
+
 	if (ir & JAB) {
 #ifdef MCDEBUG
 		printf("%s: jabber error\n", sc->sc_dev.dv_xname);
@@ -540,6 +543,8 @@ mcintr(arg)
 
 	if (ir & RCVINT)
 		mc_rint(sc);
+
+	return 1;
 }
 
 integrate void
diff --git a/sys/arch/macppc/dev/if_mcvar.h b/sys/arch/macppc/dev/if_mcvar.h
index 53b443f5e858..c95dda6c1965 100644
--- a/sys/arch/macppc/dev/if_mcvar.h
+++ b/sys/arch/macppc/dev/if_mcvar.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_mcvar.h,v 1.2 1998/07/04 22:18:29 jonathan Exp $	*/
+/*	$NetBSD: if_mcvar.h,v 1.3 1998/09/03 14:06:07 tsubai Exp $	*/
 
 /*-
  * Copyright (c) 1997 David Huang <khym@bga.com>
@@ -99,5 +99,5 @@ struct mc_softc {
 };
 
 int	mcsetup __P((struct mc_softc *, u_int8_t *));
-void	mcintr __P((void *arg));
+int	mcintr __P((void *arg));
 void	mc_rint __P((struct mc_softc *sc));