diff --git a/zha/aircube.py b/zha/aircube.py
index 0f18e32..26f873e 100644
--- a/zha/aircube.py
+++ b/zha/aircube.py
@@ -29,6 +29,7 @@ class AttributeDefs(CustomCluster.AttributeDefs):
         AirQualityCluster.cluster_id,
         endpoint_id=10,
         unit="ppm",
+        device_class=SensorDeviceClass.CO2,
         state_class=SensorStateClass.MEASUREMENT,
         fallback_name="eCO2",
     )