diff --git a/hw/serial.c b/hw/serial.c
index f3ec36a..2ae550e 100644
--- a/hw/serial.c
+++ b/hw/serial.c
@@ -401,10 +401,6 @@ static void serial_ioport_write(void *opaque,
                      s->poll_msl = 0;
                 }
             }
-            if (s->lsr & UART_LSR_THRE) {
-                s->thr_ipending = 1;
-                serial_update_irq(s);
-            }
         }
         break;
     case 2: