diff --git a/elasticsearch/dsl/document_base.py b/elasticsearch/dsl/document_base.py
index d3f7eee09..626179747 100644
--- a/elasticsearch/dsl/document_base.py
+++ b/elasticsearch/dsl/document_base.py
@@ -39,7 +39,7 @@
 try:
     import annotationlib
 except ImportError:
-    annotationlib = None
+    annotationlib = None  # type: ignore[assignment]
 
 try:
     from types import UnionType