diff --git a/sys/net/if_loop.c b/sys/net/if_loop.c
index dcc18a26427..8da57de071d 100644
--- a/sys/net/if_loop.c
+++ b/sys/net/if_loop.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)if_loop.c	8.1 (Berkeley) 6/10/93
- * $Id: if_loop.c,v 1.29 1998/01/08 23:41:26 eivind Exp $
+ * $Id: if_loop.c,v 1.30 1998/01/09 00:51:57 eivind Exp $
  */
 
 /*
@@ -289,6 +289,9 @@ loioctl(ifp, cmd, data)
 		ifp->if_mtu = ifr->ifr_mtu;
 		break;
 
+	case SIOCSIFFLAGS:
+		break;
+
 	default:
 		error = EINVAL;
 	}