diff --git a/src/rpi-cpu2mqtt.py b/src/rpi-cpu2mqtt.py
index 4a1b65f..272ed1d 100644
--- a/src/rpi-cpu2mqtt.py
+++ b/src/rpi-cpu2mqtt.py
@@ -476,6 +476,7 @@ def config_json(what_config, device="0", hass_api=False):
         data["name"] = "Wifi Signal"
         data["unit_of_measurement"] = "%"
         data["state_class"] = "measurement"
+        data["device_class"] = "signal_strength"
     elif what_config == "wifi_signal_dbm":
         data["icon"] = "mdi:wifi"
         data["name"] = "Wifi Signal"