diff --git a/src/graphql/execution/execute.py b/src/graphql/execution/execute.py
index 001a88ac..7bb48bfd 100644
--- a/src/graphql/execution/execute.py
+++ b/src/graphql/execution/execute.py
@@ -1161,7 +1161,7 @@ async def get_type():
     return None
 
 
-def default_field_resolver(source, info, **args):
+def default_field_resolver(source: Any, info: GraphQLResolveInfo, **args: Any) -> Any:
     """Default field resolver.
 
     If a resolve function is not given, then a default resolve behavior is used which