diff --git a/Lib/annotationlib.py b/Lib/annotationlib.py
index 237b3470b831fd..950c1bd9baee3d 100644
--- a/Lib/annotationlib.py
+++ b/Lib/annotationlib.py
@@ -627,7 +627,9 @@ def get_annotate_function(obj):
 
     Returns the __annotate__ function or None.
     """
-    if isinstance(obj, dict):
+    from collections.abc import Mapping
+
+    if isinstance(obj, Mapping):
         try:
             return obj["__annotate__"]
         except KeyError: