diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 9800fda8fdd5c35ca65027ceba233229d4c0efcc..b697c1eefa74915a8508f46a1b4e99ee79bb12ff 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1412,7 +1412,7 @@ static void imx_flush_buffer(struct uart_port *port)
 		temp = readl(sport->port.membase + UCR1);
 		temp &= ~UCR1_TDMAEN;
 		writel(temp, sport->port.membase + UCR1);
-		sport->dma_is_txing = false;
+		sport->dma_is_txing = 0;
 	}
 
 	/*