diff --git a/slixmpp/plugins/base.py b/slixmpp/plugins/base.py
index 37da0eea..6cf77b3e 100644
--- a/slixmpp/plugins/base.py
+++ b/slixmpp/plugins/base.py
@@ -6,6 +6,7 @@
 # Part of Slixmpp: The Slick XMPP Library
 # :copyright: (c) 2012 Nathanael C. Fritz
 # :license: MIT, see LICENSE for more details
+from __future__ import annotations
 
 import sys
 import copy