diff --git a/tests/data/devices/tze200-hr0tdd47-ts0601.json b/tests/data/devices/tze200-hr0tdd47-ts0601.json
index 25f5db269..53742dc6f 100644
--- a/tests/data/devices/tze200-hr0tdd47-ts0601.json
+++ b/tests/data/devices/tze200-hr0tdd47-ts0601.json
@@ -186,7 +186,7 @@
           "class_name": "IASZone",
           "translation_key": null,
           "translation_placeholders": null,
-          "device_class": "gas",
+          "device_class": "carbon_monoxide",
           "state_class": null,
           "entity_category": null,
           "entity_registry_enabled_default": true,
diff --git a/tests/data/devices/tze284-rjxqso4a-ts0601.json b/tests/data/devices/tze284-rjxqso4a-ts0601.json
index 28b6933cb..a09614ff1 100644
--- a/tests/data/devices/tze284-rjxqso4a-ts0601.json
+++ b/tests/data/devices/tze284-rjxqso4a-ts0601.json
@@ -192,7 +192,7 @@
           "class_name": "IASZone",
           "translation_key": null,
           "translation_placeholders": null,
-          "device_class": "gas",
+          "device_class": "carbon_monoxide",
           "state_class": null,
           "entity_category": null,
           "entity_registry_enabled_default": true,
diff --git a/zha/application/platforms/binary_sensor/const.py b/zha/application/platforms/binary_sensor/const.py
index 02ec03b38..a25958d1f 100644
--- a/zha/application/platforms/binary_sensor/const.py
+++ b/zha/application/platforms/binary_sensor/const.py
@@ -99,6 +99,6 @@ class BinarySensorDeviceClass(StrEnum):
     IasZone.ZoneType.Contact_Switch: BinarySensorDeviceClass.OPENING,
     IasZone.ZoneType.Fire_Sensor: BinarySensorDeviceClass.SMOKE,
     IasZone.ZoneType.Water_Sensor: BinarySensorDeviceClass.MOISTURE,
-    IasZone.ZoneType.Carbon_Monoxide_Sensor: BinarySensorDeviceClass.GAS,
+    IasZone.ZoneType.Carbon_Monoxide_Sensor: BinarySensorDeviceClass.CO,
     IasZone.ZoneType.Vibration_Movement_Sensor: BinarySensorDeviceClass.VIBRATION,
 }