diff --git a/plugins/dbgate-plugin-csv/src/backend/writer.js b/plugins/dbgate-plugin-csv/src/backend/writer.js
index 8e1dbeaff..c8989d86a 100644
--- a/plugins/dbgate-plugin-csv/src/backend/writer.js
+++ b/plugins/dbgate-plugin-csv/src/backend/writer.js
@@ -30,6 +30,7 @@ async function writer({ fileName, encoding = 'utf-8', header = true, delimiter,
   csvPrepare.pipe(csvStream);
   csvStream.pipe(fileStream);
   csvPrepare['finisher'] = fileStream;
+  csvPrepare.requireFixedStructure = true;
   return csvPrepare;
 }
 
diff --git a/plugins/dbgate-plugin-excel/src/backend/writer.js b/plugins/dbgate-plugin-excel/src/backend/writer.js
index d8f6a2096..5b56324f7 100644
--- a/plugins/dbgate-plugin-excel/src/backend/writer.js
+++ b/plugins/dbgate-plugin-excel/src/backend/writer.js
@@ -24,6 +24,7 @@ class ExcelSheetWriterStream extends stream.Writable {
     this.structure = null;
     this.fileName = fileName;
     this.sheetName = sheetName;
+    this.requireFixedStructure = true;
   }
   _write(chunk, enc, next) {
     if (this.structure) {