diff --git a/src/session_impl.cpp b/src/session_impl.cpp
index c983901ed..bf3750963 100644
--- a/src/session_impl.cpp
+++ b/src/session_impl.cpp
@@ -1608,7 +1608,8 @@ namespace aux {
 			|| m_settings.no_atime_storage!= s.no_atime_storage
 			|| m_settings.ignore_resume_timestamps != s.ignore_resume_timestamps
 			|| m_settings.no_recheck_incomplete_resume != s.no_recheck_incomplete_resume
-			|| m_settings.low_prio_disk != s.low_prio_disk)
+			|| m_settings.low_prio_disk != s.low_prio_disk
+			|| m_settings.lock_files != s.lock_files)
 			update_disk_io_thread = true;
 
 		bool connections_limit_changed = m_settings.connections_limit != s.connections_limit;