diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index 88ea49fee..2b6771523 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -1634,7 +1634,7 @@ grub_net_poll_cards_idle_real (void)
 	|| ctime >= card->last_poll + card->idle_poll_delay_ms)
       receive_packets (card, 0);
   }
-  if (grub_net_cards == NULL)
+  if (grub_net_cards != NULL)
     grub_net_tcp_retransmit ();
 }