diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 283cfd9..19253a6 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -334,7 +334,8 @@ static void imx_port_rts_active(struct imx_port *sport, unsigned long *ucr2)
 {
 	*ucr2 &= ~(UCR2_CTSC | UCR2_CTS);
 
-	mctrl_gpio_set(sport->gpios, sport->port.mctrl | TIOCM_RTS);
+	sport->port.mctrl |= TIOCM_RTS;
+	mctrl_gpio_set(sport->gpios, sport->port.mctrl);
 }
 
 static void imx_port_rts_inactive(struct imx_port *sport, unsigned long *ucr2)
@@ -342,7 +343,8 @@ static void imx_port_rts_inactive(struct imx_port *sport, unsigned long *ucr2)
 	*ucr2 &= ~UCR2_CTSC;
 	*ucr2 |= UCR2_CTS;
 
-	mctrl_gpio_set(sport->gpios, sport->port.mctrl & ~TIOCM_RTS);
+	sport->port.mctrl &= ~TIOCM_RTS;
+	mctrl_gpio_set(sport->gpios, sport->port.mctrl);
 }
 
 static void imx_port_rts_auto(struct imx_port *sport, unsigned long *ucr2)