diff --git a/arch/renesas/src/sh1/sh1_serial.c b/arch/renesas/src/sh1/sh1_serial.c
index 6f83416b1d..0a075400d1 100644
--- a/arch/renesas/src/sh1/sh1_serial.c
+++ b/arch/renesas/src/sh1/sh1_serial.c
@@ -157,7 +157,7 @@ static void up_shutdown(struct uart_dev_s *dev);
 static int  up_attach(struct uart_dev_s *dev);
 static void up_detach(struct uart_dev_s *dev);
 static int  up_interrupt(int irq, void *context, FAR void *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);
 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);