diff --git a/src/server/download.cxx b/src/server/download.cxx
index a9a7465..ce28db0 100644
--- a/src/server/download.cxx
+++ b/src/server/download.cxx
@@ -58,6 +58,7 @@ void Server::download(const std::shared_ptr<restbed::Session> &s) {
                     restbed::Bytes buf(1024*1024*4, 0);
                     std::ifstream f{user->user_dir / std::to_string(node->id)};
                     while (!f.eof()) {
+                        buf.resize(buf.capacity());
                         f.read((char*)buf.data(), buf.size());
                         buf.resize(f.gcount());
                         s->yield(buf);