diff --git a/sphinx/util/inspect.py b/sphinx/util/inspect.py
index 92c6ac7fb..9896ec884 100644
--- a/sphinx/util/inspect.py
+++ b/sphinx/util/inspect.py
@@ -470,7 +470,7 @@ def signature(subject: Callable, bound_method: bool = False, follow_wrapped: boo
             raise
 
     try:
-        # Resolve forwared reference annotations using ``get_type_hints()`` and type_aliases.
+        # Resolve annotations using ``get_type_hints()`` and type_aliases.
         annotations = typing.get_type_hints(subject, None, type_aliases)
         for i, param in enumerate(parameters):
             if param.name in annotations:
diff --git a/sphinx/util/typing.py b/sphinx/util/typing.py
index 7b3509b62..cc4d648be 100644
--- a/sphinx/util/typing.py
+++ b/sphinx/util/typing.py
@@ -258,7 +258,7 @@ def stringify(annotation: Any) -> str:
     if isinstance(annotation, str):
         if annotation.startswith("'") and annotation.endswith("'"):
             # might be a double Forward-ref'ed type.  Go unquoting.
-            return annotation[1:-2]
+            return annotation[1:-1]
         else:
             return annotation
     elif isinstance(annotation, TypeVar):
diff --git a/tests/test_util_inspect.py b/tests/test_util_inspect.py
index 8726544a6..cbca3c5f7 100644
--- a/tests/test_util_inspect.py
+++ b/tests/test_util_inspect.py
@@ -177,7 +177,10 @@ def test_signature_annotations():
 
     # Instance annotations
     sig = inspect.signature(f11)
-    assert stringify_signature(sig) == '(x: CustomAnnotation, y: 123) -> None'
+    if sys.version_info < (3, 10):
+        assert stringify_signature(sig) == '(x: CustomAnnotation, y: 123) -> None'
+    else:
+        assert stringify_signature(sig) == '(x: CustomAnnotation(), y: 123) -> None'
 
     # tuple with more than two items
     sig = inspect.signature(f12)