diff --git a/src/mqtt_client.cpp b/src/mqtt_client.cpp
index 35e09c4..a7014a7 100644
--- a/src/mqtt_client.cpp
+++ b/src/mqtt_client.cpp
@@ -111,7 +111,7 @@ static bool publish_discovery_sensor(const char *device_id, const char *key, con
 
   JsonObject device = doc.createNestedObject("device");
   JsonArray identifiers = device.createNestedArray("identifiers");
-  identifiers.add(String("dd3-") + device_id);
+  identifiers.add(String(device_id));
   device["name"] = String("DD3 ") + device_id;
   device["model"] = "DD3-LoRa-Bridge";
   device["manufacturer"] = "DD3";