diff --git a/TrimTask.cpp b/TrimTask.cpp
index d7bfda7..6c141f2 100644
--- a/TrimTask.cpp
+++ b/TrimTask.cpp
@@ -53,7 +53,7 @@
     VolumeManager* vm = VolumeManager::Instance();
     std::list<std::string> privateIds;
     vm->listVolumes(VolumeBase::Type::kPrivate, privateIds);
-    for (auto id : privateIds) {
+    for (const auto& id : privateIds) {
         auto vol = vm->findVolume(id);
         if (vol != nullptr && vol->getState() == VolumeBase::State::kMounted) {
             mPaths.push_back(vol->getPath());
@@ -114,7 +114,7 @@
 void TrimTask::run() {
     acquire_wake_lock(PARTIAL_WAKE_LOCK, kWakeLock);
 
-    for (auto path : mPaths) {
+    for (const auto& path : mPaths) {
         LOG(DEBUG) << "Starting trim of " << path;
 
         int fd = open(path.c_str(), O_RDONLY | O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW);