diff --git a/owwatcher/file_archiver.py b/owwatcher/file_archiver.py
index ddc0536..0fbfdcc 100644
--- a/owwatcher/file_archiver.py
+++ b/owwatcher/file_archiver.py
@@ -24,7 +24,10 @@ def __init__(self, logger, archive_path, watch_dir, archive_queue, archive_queue
         # directory. It also prevents the contents of archive_path from being
         # read by an attacker. If, for some reason, archive_path's permissions
         # are not strict enough.
-        os.umask(ARCHIVE_UMASK)
+        self.orig_umask = os.umask(ARCHIVE_UMASK)
+
+    def __del__(self):
+        os.umask(self.orig_umask)
 
     def run(self):
         self.try_read_queue = True
diff --git a/tests/test_file_archiver.py b/tests/test_file_archiver.py
index 93e8842..b3b4dc3 100644
--- a/tests/test_file_archiver.py
+++ b/tests/test_file_archiver.py
@@ -27,6 +27,7 @@ def __init__(self):
     # Need to put original functionality back so future tests aren't using the
     # mocks assigned to shutil and os.path
     def __del__(self):
+        super().__del__()
         shutil.copy2 = self.orig_copy2
         os.path.realpath = self.orig_realpath