diff --git a/backup.py b/backup.py
index a4118a4..7c6b934 100755
--- a/backup.py
+++ b/backup.py
@@ -260,7 +260,7 @@ class Backup(object):
                         exec_fd, exec_tmp = tempfile.mkstemp(prefix = '_borgextend.',
                                                              suffix = '._tmpexc',
                                                              text = True,
-                                                             dir = tmpdir)[1]
+                                                             dir = tmpdir)
                         # D'oh. I need to close the FD before messing with it.
                         os.close(exec_fd)
                         os.chmod(exec_tmp, mode = 0o0700)