diff --git a/packages/common/file-stream/streamable-file.ts b/packages/common/file-stream/streamable-file.ts
index b392a532372..7fe05c1d902 100644
--- a/packages/common/file-stream/streamable-file.ts
+++ b/packages/common/file-stream/streamable-file.ts
@@ -16,6 +16,7 @@ export class StreamableFile {
       this.stream = new Readable();
       this.stream.push(bufferOrReadStream);
       this.stream.push(null);
+      this.options.length ??= bufferOrReadStream.length;
     } else if (bufferOrReadStream.pipe && isFunction(bufferOrReadStream.pipe)) {
       this.stream = bufferOrReadStream;
     }