diff --git a/arch/arm/src/lpc43xx/lpc43_serial.c b/arch/arm/src/lpc43xx/lpc43_serial.c
index 419ec88cfdf..da1d4f2d0b3 100644
--- a/arch/arm/src/lpc43xx/lpc43_serial.c
+++ b/arch/arm/src/lpc43xx/lpc43_serial.c
@@ -114,7 +114,7 @@ static inline int up_set_rs485_mode(struct up_dev_s *priv,
 static inline int up_get_rs485_mode(struct up_dev_s *priv,
                                     struct serial_rs485 *mode);
 #endif
-static int  up_receive(struct uart_dev_s *dev, uint32_t *status);
+static int  up_receive(struct uart_dev_s *dev, unsigned int *status);
 static void up_rxint(struct uart_dev_s *dev, bool enable);
 static bool up_rxavailable(struct uart_dev_s *dev);
 static void up_send(struct uart_dev_s *dev, int ch);
@@ -1139,7 +1139,7 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
  *
  ****************************************************************************/
 
-static int up_receive(struct uart_dev_s *dev, uint32_t *status)
+static int up_receive(struct uart_dev_s *dev, unsigned int *status)
 {
   struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
   uint32_t rbr;