diff --git a/mt7615/init.c b/mt7615/init.c
index 2c5d35ba..47f23ac9 100644
--- a/mt7615/init.c
+++ b/mt7615/init.c
@@ -54,7 +54,7 @@ int mt7615_thermal_init(struct mt7615_dev *dev)
 	if (!IS_REACHABLE(CONFIG_HWMON))
 		return 0;
 
-	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7615-%s",
+	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7615_%s",
 			      wiphy_name(wiphy));
 	hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, dev,
 						       mt7615_hwmon_groups);
diff --git a/mt7915/init.c b/mt7915/init.c
index a269808b..8f63127b 100644
--- a/mt7915/init.c
+++ b/mt7915/init.c
@@ -162,7 +162,7 @@ static int mt7915_thermal_init(struct mt7915_phy *phy)
 	struct device *hwmon;
 	const char *name;
 
-	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7915-%s",
+	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7915_%s",
 			      wiphy_name(wiphy));
 
 	cdev = thermal_cooling_device_register(name, phy, &mt7915_thermal_ops);