diff --git a/drivers/gpio/gpio-wcove.c b/drivers/gpio/gpio-wcove.c
index dde7c6aecbb5e..4afc8580ecd7a 100644
--- a/drivers/gpio/gpio-wcove.c
+++ b/drivers/gpio/gpio-wcove.c
@@ -105,7 +105,7 @@ struct wcove_gpio {
 	bool set_irq_mask;
 };
 
-static inline unsigned int to_reg(int gpio, enum ctrl_register reg_type)
+static inline int to_reg(int gpio, enum ctrl_register reg_type)
 {
 	unsigned int reg;