diff --git a/contrib/etc/ebusd/mqtt-hassio.cfg b/contrib/etc/ebusd/mqtt-hassio.cfg
index 178bfc07..9c438ee5 100644
--- a/contrib/etc/ebusd/mqtt-hassio.cfg
+++ b/contrib/etc/ebusd/mqtt-hassio.cfg
@@ -380,6 +380,7 @@ def_global_running-payload = %global_prefix,
   "device_class":"running"%global_boolean_suffix
 def_global_version-topic =
 def_global_uptime-payload = %global_prefix,
+  "device_class":"duration",
   "state_class":"total_increasing",
   "unit_of_measurement":"s"
  }