diff --git a/src/line/types.ts b/src/line/types.ts
index 8a79701625..2d160910eb 100644
--- a/src/line/types.ts
+++ b/src/line/types.ts
@@ -11,26 +11,7 @@ import type { BaseProbeResult } from "../channels/plugins/types.js";
 
 export type LineTokenSource = "config" | "env" | "file" | "none";
 
-export interface LineConfig {
-  enabled?: boolean;
-  channelAccessToken?: string;
-  channelSecret?: string;
-  tokenFile?: string;
-  secretFile?: string;
-  name?: string;
-  allowFrom?: Array<string | number>;
-  groupAllowFrom?: Array<string | number>;
-  dmPolicy?: "open" | "allowlist" | "pairing" | "disabled";
-  groupPolicy?: "open" | "allowlist" | "disabled";
-  /** Outbound response prefix override for this channel/account. */
-  responsePrefix?: string;
-  mediaMaxMb?: number;
-  webhookPath?: string;
-  accounts?: Record<string, LineAccountConfig>;
-  groups?: Record<string, LineGroupConfig>;
-}
-
-export interface LineAccountConfig {
+interface LineAccountBaseConfig {
   enabled?: boolean;
   channelAccessToken?: string;
   channelSecret?: string;
@@ -48,6 +29,13 @@ export interface LineAccountConfig {
   groups?: Record<string, LineGroupConfig>;
 }
 
+export interface LineConfig extends LineAccountBaseConfig {
+  /** Per-account overrides keyed by account id. */
+  accounts?: Record<string, LineAccountConfig>;
+}
+
+export interface LineAccountConfig extends LineAccountBaseConfig {}
+
 export interface LineGroupConfig {
   enabled?: boolean;
   allowFrom?: Array<string | number>;