diff --git a/sys/net/if_tap.c b/sys/net/if_tap.c
index 99c5968e324..92563012c28 100644
--- a/sys/net/if_tap.c
+++ b/sys/net/if_tap.c
@@ -611,9 +611,7 @@ tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 			break;
 
 		case SIOCSIFMTU:
-			s = splimp();
 			ifp->if_mtu = ifr->ifr_mtu;
-			splx(s);
 			break;
 
 		case SIOCGIFSTATUS: