diff --git a/drivers/regulator/rk808-regulator.c b/drivers/regulator/rk808-regulator.c
index 9924740c95f8..0c9f4404c7e8 100644
--- a/drivers/regulator/rk808-regulator.c
+++ b/drivers/regulator/rk808-regulator.c
@@ -711,7 +711,7 @@ static unsigned int rk8xx_get_mode(struct regulator_dev *rdev)
 		return REGULATOR_MODE_NORMAL;
 }
 
-int rk8xx_is_enabled_wmsk_regmap(struct regulator_dev *rdev)
+static int rk8xx_is_enabled_wmsk_regmap(struct regulator_dev *rdev)
 {
 	unsigned int val;
 	int ret;