diff --git a/src/libstore/filetransfer.cc b/src/libstore/filetransfer.cc
index 42b93cfe00a..8439cc39cc8 100644
--- a/src/libstore/filetransfer.cc
+++ b/src/libstore/filetransfer.cc
@@ -767,7 +767,7 @@ struct curlFileTransfer : public FileTransfer
                 auto s3Res = s3Helper.getObject(bucketName, key);
                 FileTransferResult res;
                 if (!s3Res.data)
-                    throw FileTransferError(NotFound, "S3 object '%s' does not exist", request.uri);
+                    throw FileTransferError(NotFound, {}, "S3 object '%s' does not exist", request.uri);
                 res.data = std::move(*s3Res.data);
                 res.urls.push_back(request.uri);
                 callback(std::move(res));