diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 67426c0477d34b2b5805826664bbc4074acfe591..b6b3aa8ef5db2b0fd14ca4d071ec592d53afae44 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -293,7 +293,8 @@ static int regulator_check_current_limit(struct regulator_dev *rdev,
 }
 
 /* operating mode constraint check */
-static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
+static int regulator_mode_constrain(struct regulator_dev *rdev,
+				    unsigned int *mode)
 {
 	switch (*mode) {
 	case REGULATOR_MODE_FAST: