diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 3e8a4cfd699..4900143516e 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -1347,7 +1347,7 @@ static int uart_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 #ifdef CONFIG_SERIAL_IFLOWCONTROL
                   /* De-activate RX flow control. */
 
-                  uart_rxflowcontrol(dev, 0, false);
+                  (void)uart_rxflowcontrol(dev, 0, false);
 #endif
                 }