diff --git a/PayfritBeacon/Api.swift b/PayfritBeacon/Api.swift
index fcaed4e..b924ad1 100644
--- a/PayfritBeacon/Api.swift
+++ b/PayfritBeacon/Api.swift
@@ -341,7 +341,7 @@ class Api {
             "UUID": uuid,
             "Major": major,
             "Minor": minor,
-            "hardware_id": hardwareId
+            "HardwareId": hardwareId
         ]
         if let mac = macAddress, !mac.isEmpty {
             body["MACAddress"] = mac