diff --git a/hw/char/lm32_juart.c b/hw/char/lm32_juart.c
index 252fe46daf..380cb5dbea 100644
--- a/hw/char/lm32_juart.c
+++ b/hw/char/lm32_juart.c
@@ -75,7 +75,7 @@ void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
 
     s->jtx = jtx;
     if (s->chr) {
-        qemu_chr_fe_write(s->chr, &ch, 1);
+        qemu_chr_fe_write_all(s->chr, &ch, 1);
     }
 }
 
diff --git a/hw/char/lm32_uart.c b/hw/char/lm32_uart.c
index 85d726508b..84c2549cb7 100644
--- a/hw/char/lm32_uart.c
+++ b/hw/char/lm32_uart.c
@@ -177,7 +177,7 @@ static void uart_write(void *opaque, hwaddr addr,
     switch (addr) {
     case R_RXTX:
         if (s->chr) {
-            qemu_chr_fe_write(s->chr, &ch, 1);
+            qemu_chr_fe_write_all(s->chr, &ch, 1);
         }
         break;
     case R_IER: