diff --git a/download_action.cc b/download_action.cc
index 89638c4..57070b5 100644
--- a/download_action.cc
+++ b/download_action.cc
@@ -25,9 +25,6 @@
 
 namespace chromeos_update_engine {
 
-// Use a buffer to reduce the number of IOPS on SSD devices.
-const size_t kFileWriterBufferSize = 128 * 1024;  // 128 KiB
-
 DownloadAction::DownloadAction(PrefsInterface* prefs,
                                SystemState* system_state,
                                HttpFetcher* http_fetcher)