diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 76c8fa1884ecc93367396eb78a200b43c557b2a2..6b8f12f4a7054f12f481137189b857c8ca016021 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -211,7 +211,7 @@ struct imx_port {
 	struct timer_list	timer;
 	unsigned int		old_status;
 	int			txirq,rxirq,rtsirq;
-	int			have_rtscts:1;
+	unsigned int		have_rtscts:1;
 	struct clk		*clk;
 };