diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 76c8fa1..6b8f12f4 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -211,7 +211,7 @@
 	struct timer_list	timer;
 	unsigned int		old_status;
 	int			txirq,rxirq,rtsirq;
-	int			have_rtscts:1;
+	unsigned int		have_rtscts:1;
 	struct clk		*clk;
 };