diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index c065a70..42be8b01 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -1318,7 +1318,7 @@
 	 * If the baud rate generator isn't running, the port wasn't
 	 * initialized by the boot loader.
 	 */
-	quot = UART_GET_BRGR(port);
+	quot = UART_GET_BRGR(port) & ATMEL_US_CD;
 	if (!quot)
 		return;