diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c
index 89f5d68..98c62b4 100644
--- a/drivers/serial/serial_s5p.c
+++ b/drivers/serial/serial_s5p.c
@@ -100,8 +100,8 @@
 {
 	struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
 
-	/* enable FIFOs */
-	writel(0x1, &uart->ufcon);
+	/* enable FIFOs, auto clear Rx FIFO */
+	writel(0x3, &uart->ufcon);
 	writel(0, &uart->umcon);
 	/* 8N1 */
 	writel(0x3, &uart->ulcon);