diff --git a/contrib/etc/ebusd/mqtt-hassio.cfg b/contrib/etc/ebusd/mqtt-hassio.cfg
index fbf2c805..d3d4d616 100644
--- a/contrib/etc/ebusd/mqtt-hassio.cfg
+++ b/contrib/etc/ebusd/mqtt-hassio.cfg
@@ -327,6 +327,10 @@ def_global_signal-topic = %haprefix/binary_sensor/%TOPIC/config
 def_global_signal-payload = %global_prefix,
   "device_class":"connectivity"%global_boolean_suffix
 
+def_global_updatecheck-payload = %global_prefix,
+  "state_class":"measurement",
+  "value_template":"{{value_json|truncate(255)}}"
+ }
 
 # the topic and payload to listen to in order to republish all config messages.
 # HA integration: force republish of all configs when HA goes down and comes up again.