diff --git a/repertory/librepertory/src/file_manager/file_manager.cpp b/repertory/librepertory/src/file_manager/file_manager.cpp
index 04a815bd..f1a29ab3 100644
--- a/repertory/librepertory/src/file_manager/file_manager.cpp
+++ b/repertory/librepertory/src/file_manager/file_manager.cpp
@@ -97,7 +97,7 @@ void file_manager::close_timed_out_files() {
   auto closeable_list =
       std::accumulate(open_file_lookup_.begin(), open_file_lookup_.end(),
                       std::vector<std::shared_ptr<i_closeable_open_file>>{},
-                      [](auto items, const auto &item) -> auto {
+                      [](auto &&items, auto &&item) -> auto {
                         if (item.second->get_open_file_count() == 0U &&
                             item.second->can_close()) {
                           items.push_back(item.second);
@@ -272,7 +272,7 @@ auto file_manager::get_open_files() const
   recur_mutex_lock open_lock(open_file_mtx_);
   return std::accumulate(open_file_lookup_.begin(), open_file_lookup_.end(),
                          std::unordered_map<std::string, std::size_t>{},
-                         [](auto map, const auto &item) -> std::size_t {
+                         [](auto &&map, auto &&item) -> auto {
                            map[item.first] = item.second->get_open_file_count();
                            return map;
                          });
@@ -280,11 +280,11 @@ auto file_manager::get_open_files() const
 
 auto file_manager::get_open_handle_count() const -> std::size_t {
   recur_mutex_lock open_lock(open_file_mtx_);
-  return std::accumulate(
-      open_file_lookup_.begin(), open_file_lookup_.end(), std::size_t(0U),
-      [](std::size_t count, const auto &item) -> std::size_t {
-        return count + item.second->get_open_file_count();
-      });
+  return std::accumulate(open_file_lookup_.begin(), open_file_lookup_.end(),
+                         std::size_t(0U),
+                         [](auto &&count, auto &&item) -> auto {
+                           return count + item.second->get_open_file_count();
+                         });
 }
 
 auto file_manager::get_stored_downloads() const