diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 145f13580ff0499e70ed3f32c52f72f532ef8782..9140236a0182b4f73d80efbab7d6fdac11aca539 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -391,6 +391,7 @@ static ssize_t show_str(struct device *dev,
 		break;
 	default:
 		BUG();
+		val = "";
 	}
 
 	return sprintf(buf, "%s\n", val);