diff --git a/drivers/regulator/regulator_npm6001.c b/drivers/regulator/regulator_npm6001.c
index 21086b3ad60..32e8c3192e3 100644
--- a/drivers/regulator/regulator_npm6001.c
+++ b/drivers/regulator/regulator_npm6001.c
@@ -383,7 +383,10 @@ static int regulator_npm6001_set_voltage(const struct device *dev,
 	case NPM6001_SOURCE_LDO0:
 		return regulator_npm6001_ldo0_set_voltage(dev, min_uv, max_uv);
 	case NPM6001_SOURCE_LDO1:
-		return -ENOTSUP;
+		if ((min_uv != 1800000) && (max_uv != 1800000)) {
+			return -EINVAL;
+		}
+		break;
 	default:
 		__ASSERT(NULL, "Unexpected source");
 	}