diff --git a/drivers/usb/serial/cyberjack.c b/drivers/usb/serial/cyberjack.c
index 781426230d695a3f34544ab4b0a589a500a0063e..6e1b69d0f5f57da980f439a3643567ada4aec3b6 100644
--- a/drivers/usb/serial/cyberjack.c
+++ b/drivers/usb/serial/cyberjack.c
@@ -279,7 +279,7 @@ static void cyberjack_read_int_callback(struct urb *urb)
 
 		old_rdtodo = priv->rdtodo;
 
-		if (old_rdtodo + size < old_rdtodo) {
+		if (old_rdtodo > SHRT_MAX - size) {
 			dev_dbg(dev, "To many bulk_in urbs to do.\n");
 			spin_unlock(&priv->lock);
 			goto resubmit;