diff --git a/backend/app/services/openclaw/gateway_rpc.py b/backend/app/services/openclaw/gateway_rpc.py
index 32abf1c..cadcd76 100644
--- a/backend/app/services/openclaw/gateway_rpc.py
+++ b/backend/app/services/openclaw/gateway_rpc.py
@@ -180,11 +180,22 @@ class GatewayConfig:
     disable_device_pairing: bool = False
 
 
+def _normalise_gateway_scheme(url: str) -> str:
+    """Convert http/https gateway URLs to the ws/wss scheme websockets expects."""
+    parsed = urlparse(url)
+    if parsed.scheme == "http":
+        return urlunparse(parsed._replace(scheme="ws"))
+    if parsed.scheme == "https":
+        return urlunparse(parsed._replace(scheme="wss"))
+    return url
+
+
 def _build_gateway_url(config: GatewayConfig) -> str:
     base_url: str = (config.url or "").strip()
     if not base_url:
         message = "Gateway URL is not configured."
         raise OpenClawGatewayError(message)
+    base_url = _normalise_gateway_scheme(base_url)
     token = config.token
     if not token:
         return base_url