diff --git a/Build/build-domestic-direct-lan-ruleset-dns-mapping-module.ts b/Build/build-domestic-direct-lan-ruleset-dns-mapping-module.ts
index c838e88a..e4ffd8c5 100644
--- a/Build/build-domestic-direct-lan-ruleset-dns-mapping-module.ts
+++ b/Build/build-domestic-direct-lan-ruleset-dns-mapping-module.ts
@@ -73,6 +73,11 @@ export const getDomesticAndDirectDomainsRulesetPromise = createMemoizedPromise(a
     appendArrayInPlace(directs, domains.flatMap(getDnsMappingRuleWithWildcard));
   });
 
+  // backward compatible, add lan.conf
+  Object.values(LAN).forEach(({ domains }) => {
+    appendArrayInPlace(lans, domains.flatMap(getDnsMappingRuleWithWildcard));
+  });
+
   return [domestics, directs, lans] as const;
 });