diff --git a/drivers/iio/light/opt3001.c b/drivers/iio/light/opt3001.c
index 6634054506da..c301549ddaa7 100644
--- a/drivers/iio/light/opt3001.c
+++ b/drivers/iio/light/opt3001.c
@@ -226,8 +226,7 @@ static const struct opt3001_scale opt3002_scales[] = {
 static int opt3001_find_scale(const struct opt3001 *opt, int val, int val2,
 			      u8 *exponent)
 {
-	int i;
-	for (i = 0; i < ARRAY_SIZE(*opt->chip_info->scales); i++) {
+	for (unsigned int i = 0; i < ARRAY_SIZE(*opt->chip_info->scales); i++) {
 		const struct opt3001_scale *scale = &(*opt->chip_info->scales)[i];
 		/*
 		 * Compare the integer and micro parts to determine value scale.