diff --git a/sys/dev/hyperv/if_hvn.c b/sys/dev/hyperv/if_hvn.c
index c9aa3573919d..4beede4be7d8 100644
--- a/sys/dev/hyperv/if_hvn.c
+++ b/sys/dev/hyperv/if_hvn.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_hvn.c,v 1.18 2020/05/24 10:31:59 nonaka Exp $	*/
+/*	$NetBSD: if_hvn.c,v 1.19 2020/12/11 08:13:08 nonaka Exp $	*/
 /*	$OpenBSD: if_hvn.c,v 1.39 2018/03/11 14:31:34 mikeb Exp $	*/
 
 /*-
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_hvn.c,v 1.18 2020/05/24 10:31:59 nonaka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_hvn.c,v 1.19 2020/12/11 08:13:08 nonaka Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -387,26 +387,7 @@ hvn_ioctl(struct ifnet *ifp, u_long command, void * data)
 
 	s = splnet();
 
-	switch (command) {
-	case SIOCSIFFLAGS:
-		if (ifp->if_flags & IFF_UP) {
-			if (ifp->if_flags & IFF_RUNNING)
-				error = ENETRESET;
-			else {
-				error = hvn_init(ifp);
-				if (error)
-					ifp->if_flags &= ~IFF_UP;
-			}
-		} else {
-			if (ifp->if_flags & IFF_RUNNING)
-				hvn_stop(ifp, 1);
-		}
-		break;
-	default:
-		error = ether_ioctl(ifp, command, data);
-		break;
-	}
-
+	error = ether_ioctl(ifp, command, data);
 	if (error == ENETRESET) {
 		if (ifp->if_flags & IFF_RUNNING)
 			hvn_iff(sc);