diff --git a/drivers/isdn/hisax/st5481_b.c b/drivers/isdn/hisax/st5481_b.c
index 0a2536d62402..657817a591fe 100644
--- a/drivers/isdn/hisax/st5481_b.c
+++ b/drivers/isdn/hisax/st5481_b.c
@@ -209,9 +209,7 @@ static void st5481B_mode(struct st5481_bcs *bcs, int mode)
 	bcs->mode = mode;
 
 	// Cancel all USB transfers on this B channel
-	b_out->urb[0]->transfer_flags |= URB_ASYNC_UNLINK;
 	usb_unlink_urb(b_out->urb[0]);
-	b_out->urb[1]->transfer_flags |= URB_ASYNC_UNLINK;
 	usb_unlink_urb(b_out->urb[1]);
 	b_out->busy = 0;
 
diff --git a/drivers/isdn/hisax/st5481_usb.c b/drivers/isdn/hisax/st5481_usb.c
index ffd5b2d45552..89fbeb58485d 100644
--- a/drivers/isdn/hisax/st5481_usb.c
+++ b/drivers/isdn/hisax/st5481_usb.c
@@ -645,9 +645,7 @@ void st5481_in_mode(struct st5481_in *in, int mode)
 
 	in->mode = mode;
 
-	in->urb[0]->transfer_flags |= URB_ASYNC_UNLINK;
 	usb_unlink_urb(in->urb[0]);
-	in->urb[1]->transfer_flags |= URB_ASYNC_UNLINK;
 	usb_unlink_urb(in->urb[1]);
 
 	if (in->mode != L1_MODE_NULL) {