diff --git a/src/onebot/api/msg.ts b/src/onebot/api/msg.ts
index a96ee1f1..2e760dee 100644
--- a/src/onebot/api/msg.ts
+++ b/src/onebot/api/msg.ts
@@ -253,7 +253,7 @@ export class OneBotMsgApi {
                 msg.senderUid,
                 elementWrapper.elementId,
                 elementWrapper.elementType.toString(),
-                element.fileSize || '0',
+                element.fileSize ?? '0',
                 element.fileName,
             );