diff --git a/homekit-controller/src/lib.rs b/homekit-controller/src/lib.rs
index 5a2badd..0521abd 100644
--- a/homekit-controller/src/lib.rs
+++ b/homekit-controller/src/lib.rs
@@ -145,7 +145,7 @@ impl DevicePairingData {
         let ios_device_info = {
             let mut buf = pubkey.as_bytes().to_vec();
             buf.extend_from_slice(self.ios_pairing_id.as_bytes());
-            buf.extend_from_slice(pubkey.as_bytes());
+            buf.extend_from_slice(response_pubkey);
             buf
         };
         // 8. Use Ed25519 togenerate iOSDeviceSignature by signing iOSDeviceInfo with its long-term secret key, iOSDeviceLTSK