diff --git a/surfsense_backend/app/routes/mcp_oauth_route.py b/surfsense_backend/app/routes/mcp_oauth_route.py
index f7164eab3..98ca2be0f 100644
--- a/surfsense_backend/app/routes/mcp_oauth_route.py
+++ b/surfsense_backend/app/routes/mcp_oauth_route.py
@@ -165,7 +165,7 @@ async def connect_mcp_service(
             "state": state,
         }
         if svc.scopes:
-            auth_params["scope"] = " ".join(svc.scopes)
+            auth_params[svc.scope_param] = " ".join(svc.scopes)
 
         auth_url = f"{auth_endpoint}?{urlencode(auth_params)}"
 
@@ -478,7 +478,7 @@ async def reauth_mcp_service(
             "state": state,
         }
         if svc.scopes:
-            auth_params["scope"] = " ".join(svc.scopes)
+            auth_params[svc.scope_param] = " ".join(svc.scopes)
 
         auth_url = f"{auth_endpoint}?{urlencode(auth_params)}"
 
diff --git a/surfsense_backend/app/services/mcp_oauth/registry.py b/surfsense_backend/app/services/mcp_oauth/registry.py
index 4d87ceb40..62eb2077f 100644
--- a/surfsense_backend/app/services/mcp_oauth/registry.py
+++ b/surfsense_backend/app/services/mcp_oauth/registry.py
@@ -21,6 +21,7 @@ class MCPServiceConfig:
     client_id_env: str | None = None
     client_secret_env: str | None = None
     scopes: list[str] = field(default_factory=list)
+    scope_param: str = "scope"
 
 
 MCP_SERVICES: dict[str, MCPServiceConfig] = {
@@ -46,6 +47,7 @@ MCP_SERVICES: dict[str, MCPServiceConfig] = {
         supports_dcr=False,
         client_id_env="SLACK_CLIENT_ID",
         client_secret_env="SLACK_CLIENT_SECRET",
+        scope_param="user_scope",
         scopes=[
             "search:read.public", "search:read.private", "search:read.mpim",
             "search:read.im", "search:read.files", "search:read.users",