diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 5be8728c88a3..36e6f4d4ec3b 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -598,7 +598,7 @@ thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 	temp->tz = tz;
 	hwmon->count++;
 
-	snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
+	snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
 		 "temp%d_input", hwmon->count);
 	temp->temp_input.attr.attr.name = temp->temp_input.name;
 	temp->temp_input.attr.attr.mode = 0444;
@@ -611,7 +611,8 @@ thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 	if (tz->ops->get_crit_temp) {
 		unsigned long temperature;
 		if (!tz->ops->get_crit_temp(tz, &temperature)) {
-			snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
+			snprintf(temp->temp_crit.name,
+				 sizeof(temp->temp_crit.name),
 				"temp%d_crit", hwmon->count);
 			temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 			temp->temp_crit.attr.attr.mode = 0444;