diff --git a/kernel/drivers/serial/rt_imx_uart.c b/kernel/drivers/serial/rt_imx_uart.c
index 443a34261436b4002266600bc9970ec44e33176b..574fd1aa7a2608e41a516c89c94282e24c1f3697 100644
--- a/kernel/drivers/serial/rt_imx_uart.c
+++ b/kernel/drivers/serial/rt_imx_uart.c
@@ -1433,7 +1433,7 @@ static ssize_t rt_imx_uart_write(struct rtdm_fd *fd, const void *buf,
 				/* Device has been closed -
 				 * return immediately.
 				 */
-				return -EBADF;
+				ret = -EBADF;
 			}
 			if (ret == -EWOULDBLOCK) {
 				/* Fix error code for non-blocking mode. */