diff --git a/source/modules/database/interfaces/IDatabaseArcPlayer.ts b/source/modules/database/interfaces/IDatabaseArcPlayer.ts
index 7ed84b4..a7d3df2 100644
--- a/source/modules/database/interfaces/IDatabaseArcPlayer.ts
+++ b/source/modules/database/interfaces/IDatabaseArcPlayer.ts
@@ -2,6 +2,6 @@ export default interface IDatabaseArcPlayer {
   uid: number,
   code: string,
   name: string,
-  ptt: number,
+  ptt?: number,
   join_date: number
 }
diff --git a/source/publicapi/v1/songinfo.ts b/source/publicapi/v1/songinfo.ts
index 2a5f259..bac5e05 100644
--- a/source/publicapi/v1/songinfo.ts
+++ b/source/publicapi/v1/songinfo.ts
@@ -33,7 +33,7 @@ export default (argument: any): Promise<any> => {
         _arc_songinfo = await arcsong_bysongid(_arc_songid);
       } catch (e) { syslog.e(TAG, e.stack); throw new APIError(-4, 'internal error'); }
 
-      const _return = {
+      const _return: any = {
         id: _arc_songinfo.sid,
         title_localized: {
           en: _arc_songinfo.name_en,
diff --git a/source/publicapi/v2/songinfo.ts b/source/publicapi/v2/songinfo.ts
index 11754cb..520aa33 100644
--- a/source/publicapi/v2/songinfo.ts
+++ b/source/publicapi/v2/songinfo.ts
@@ -33,7 +33,7 @@ export default (argument: any): Promise<any> => {
         _arc_songinfo = await arcsong_bysongid(_arc_songid);
       } catch (e) { syslog.e(TAG, e.stack); throw new APIError(-4, 'internal error'); }
 
-      const _return = {
+      const _return: any = {
         id: _arc_songinfo.sid,
         title_localized: {
           en: _arc_songinfo.name_en,