diff --git a/src/line/config-schema.ts b/src/line/config-schema.ts
index 55804f81e5..f1efe42d9e 100644
--- a/src/line/config-schema.ts
+++ b/src/line/config-schema.ts
@@ -3,6 +3,22 @@ import { z } from "zod";
 const DmPolicySchema = z.enum(["open", "allowlist", "pairing", "disabled"]);
 const GroupPolicySchema = z.enum(["open", "allowlist", "disabled"]);
 
+const LineCommonConfigSchema = z.object({
+  enabled: z.boolean().optional(),
+  channelAccessToken: z.string().optional(),
+  channelSecret: z.string().optional(),
+  tokenFile: z.string().optional(),
+  secretFile: z.string().optional(),
+  name: z.string().optional(),
+  allowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+  groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+  dmPolicy: DmPolicySchema.optional().default("pairing"),
+  groupPolicy: GroupPolicySchema.optional().default("allowlist"),
+  responsePrefix: z.string().optional(),
+  mediaMaxMb: z.number().optional(),
+  webhookPath: z.string().optional(),
+});
+
 const LineGroupConfigSchema = z
   .object({
     enabled: z.boolean().optional(),
@@ -14,39 +30,13 @@ const LineGroupConfigSchema = z
   .strict();
 
 const LineAccountConfigSchema = z
-  .object({
-    enabled: z.boolean().optional(),
-    channelAccessToken: z.string().optional(),
-    channelSecret: z.string().optional(),
-    tokenFile: z.string().optional(),
-    secretFile: z.string().optional(),
-    name: z.string().optional(),
-    allowFrom: z.array(z.union([z.string(), z.number()])).optional(),
-    groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
-    dmPolicy: DmPolicySchema.optional().default("pairing"),
-    groupPolicy: GroupPolicySchema.optional().default("allowlist"),
-    responsePrefix: z.string().optional(),
-    mediaMaxMb: z.number().optional(),
-    webhookPath: z.string().optional(),
+  .extend({
     groups: z.record(z.string(), LineGroupConfigSchema.optional()).optional(),
   })
   .strict();
 
 export const LineConfigSchema = z
-  .object({
-    enabled: z.boolean().optional(),
-    channelAccessToken: z.string().optional(),
-    channelSecret: z.string().optional(),
-    tokenFile: z.string().optional(),
-    secretFile: z.string().optional(),
-    name: z.string().optional(),
-    allowFrom: z.array(z.union([z.string(), z.number()])).optional(),
-    groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
-    dmPolicy: DmPolicySchema.optional().default("pairing"),
-    groupPolicy: GroupPolicySchema.optional().default("allowlist"),
-    responsePrefix: z.string().optional(),
-    mediaMaxMb: z.number().optional(),
-    webhookPath: z.string().optional(),
+  .extend({
     accounts: z.record(z.string(), LineAccountConfigSchema.optional()).optional(),
     groups: z.record(z.string(), LineGroupConfigSchema.optional()).optional(),
   })