diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
index f376e3fd66fd..d4ed36ee37c1 100644
--- a/sys/ufs/ufs/ufs_vnops.c
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -240,22 +240,17 @@ ufs_mknod(ap)
  */
 /* ARGSUSED */
 static int
-ufs_open(ap)
-	struct vop_open_args /* {
-		struct vnode *a_vp;
-		int  a_mode;
-		struct ucred *a_cred;
-		struct thread *a_td;
-	} */ *ap;
+ufs_open(struct vop_open_args *ap)
 {
+	struct vnode *vp = ap->a_vp;
 
-	if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
+	if (vp->v_type == VCHR || vp->v_type == VBLK)
 		return (EOPNOTSUPP);
 
 	/*
 	 * Files marked append-only must be opened for appending.
 	 */
-	if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
+	if ((VTOI(vp)->i_flags & APPEND) &&
 	    (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
 		return (EPERM);
 	return (0);