diff --git a/src/util/hass-attributes-util.ts b/src/util/hass-attributes-util.ts
index 46f181e10c..9c5fec0816 100644
--- a/src/util/hass-attributes-util.ts
+++ b/src/util/hass-attributes-util.ts
@@ -14,6 +14,7 @@ const hassAttributeUtil = {
   DOMAIN_DEVICE_CLASS: {
     binary_sensor: [
       "battery",
+      "carbon_monoxide",
       "cold",
       "connectivity",
       "door",