diff --git a/sphinx/ext/autodoc/importer.py b/sphinx/ext/autodoc/importer.py
index 427fae7d6..8513255c1 100644
--- a/sphinx/ext/autodoc/importer.py
+++ b/sphinx/ext/autodoc/importer.py
@@ -11,7 +11,7 @@
 import importlib
 import traceback
 import warnings
-from typing import Any, Callable, Dict, List, Mapping, NamedTuple, Optional, Tuple
+from typing import Any, Callable, Dict, List, NamedTuple, Optional, Tuple
 
 from sphinx.pycode import ModuleAnalyzer
 from sphinx.util import logging
@@ -173,12 +173,6 @@ def _getmro(obj: Any) -> Tuple["Type", ...]:
         return tuple()
 
 
-def _getannotations(obj: Any) -> Mapping[str, Any]:
-    warnings.warn('sphinx.ext.autodoc.importer._getannotations() is deprecated.',
-                  RemovedInSphinx40Warning)
-    return getannotations(obj)
-
-
 def get_object_members(subject: Any, objpath: List[str], attrgetter: Callable,
                        analyzer: ModuleAnalyzer = None) -> Dict[str, Attribute]:
     """Get members and attributes of target object."""
diff --git a/sphinx/pycode/__init__.py b/sphinx/pycode/__init__.py
index 718380881..d69ab64bd 100644
--- a/sphinx/pycode/__init__.py
+++ b/sphinx/pycode/__init__.py
@@ -10,6 +10,7 @@
 
 import re
 import tokenize
+import warnings
 from collections import OrderedDict
 from importlib import import_module
 from inspect import Signature