diff --git a/backend/app/services/openclaw/gateway_rpc.py b/backend/app/services/openclaw/gateway_rpc.py
index 85a67124..32abf1cb 100644
--- a/backend/app/services/openclaw/gateway_rpc.py
+++ b/backend/app/services/openclaw/gateway_rpc.py
@@ -9,6 +9,7 @@ from __future__ import annotations
 
 import asyncio
 import json
+import platform as _platform
 import ssl
 from dataclasses import dataclass
 from time import perf_counter, time
@@ -28,6 +29,9 @@ from app.services.openclaw.device_identity import (
 )
 
 PROTOCOL_VERSION = 3
+# Resolved once at import time; matches the value written by the openclaw CLI
+# during pairing ("linux", "darwin", or "windows").
+_HOST_PLATFORM: str = _platform.system().lower()
 logger = get_logger(__name__)
 GATEWAY_OPERATOR_SCOPES = (
     "operator.read",
@@ -334,7 +338,7 @@ def _build_connect_params(
         "client": {
             "id": CONTROL_UI_CLIENT_ID if use_control_ui else DEFAULT_GATEWAY_CLIENT_ID,
             "version": "1.0.0",
-            "platform": "python",
+            "platform": _HOST_PLATFORM,
             "mode": CONTROL_UI_CLIENT_MODE if use_control_ui else DEFAULT_GATEWAY_CLIENT_MODE,
         },
     }
diff --git a/backend/tests/test_gateway_rpc_connect_scopes.py b/backend/tests/test_gateway_rpc_connect_scopes.py
index 00a1db86..c37600a8 100644
--- a/backend/tests/test_gateway_rpc_connect_scopes.py
+++ b/backend/tests/test_gateway_rpc_connect_scopes.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import platform
+
 import pytest
 
 import app.services.openclaw.gateway_rpc as gateway_rpc
@@ -57,6 +59,7 @@ def test_build_connect_params_defaults_to_device_pairing(
     assert params["scopes"] == list(GATEWAY_OPERATOR_SCOPES)
     assert params["client"]["id"] == DEFAULT_GATEWAY_CLIENT_ID
     assert params["client"]["mode"] == DEFAULT_GATEWAY_CLIENT_MODE
+    assert params["client"]["platform"] == platform.system().lower()
     assert params["device"] == expected_device_payload
     assert "auth" not in params
     assert captured["client_id"] == DEFAULT_GATEWAY_CLIENT_ID
@@ -80,6 +83,7 @@ def test_build_connect_params_uses_control_ui_when_pairing_disabled() -> None:
     assert params["scopes"] == list(GATEWAY_OPERATOR_SCOPES)
     assert params["client"]["id"] == CONTROL_UI_CLIENT_ID
     assert params["client"]["mode"] == CONTROL_UI_CLIENT_MODE
+    assert params["client"]["platform"] == platform.system().lower()
     assert "device" not in params