diff --git a/offlineimap/threadutil.py b/offlineimap/threadutil.py
index 65028ee..155a563 100644
--- a/offlineimap/threadutil.py
+++ b/offlineimap/threadutil.py
@@ -122,12 +122,10 @@ def threadexited(thread):
             raise SystemExit
         ui.threadException(thread)      # Expected to terminate
         sys.exit(100)                   # Just in case...
-        os._exit(100)
     elif thread.getExitMessage() == 'SYNC_WITH_TIMER_TERMINATE':
         ui.terminate()
         # Just in case...
         sys.exit(100)
-        os._exit(100)
     else:
         ui.threadExited(thread)