diff --git a/elasticsearch/dsl/document_base.py b/elasticsearch/dsl/document_base.py
index 0ac59ae54..d5411576c 100644
--- a/elasticsearch/dsl/document_base.py
+++ b/elasticsearch/dsl/document_base.py
@@ -38,7 +38,7 @@
 try:
     import annotationlib
 except ImportError:
-    annotationlib = None
+    annotationlib = None  # type: ignore[assignment]
 
 try:
     from types import UnionType