diff --git a/CHANGES b/CHANGES
index 84f1798c3..600efc466 100644
--- a/CHANGES
+++ b/CHANGES
@@ -41,6 +41,7 @@ Bugs fixed
   typing.Generic
 * #8157: autodoc: TypeError is raised when annotation has invalid __args__
 * #7964: autodoc: Tuple in default value is wrongly rendered
+* #8200: autodoc: type aliases break type formatting of autoattribute
 * #8192: napoleon: description is disappeared when it contains inline literals
 * #8142: napoleon: Potential of regex denial of service in google style docs
 * #8169: LaTeX: pxjahyper loaded even when latex_engine is not platex
diff --git a/sphinx/ext/autodoc/__init__.py b/sphinx/ext/autodoc/__init__.py
index 6eff27102..434fc40e9 100644
--- a/sphinx/ext/autodoc/__init__.py
+++ b/sphinx/ext/autodoc/__init__.py
@@ -1736,7 +1736,8 @@ class GenericAliasDocumenter(DataDocumenter):
         return inspect.isgenericalias(member)
 
     def add_directive_header(self, sig: str) -> None:
-        self.options.annotation = SUPPRESS  # type: ignore
+        self.options = Options(self.options)
+        self.options['annotation'] = SUPPRESS
         super().add_directive_header(sig)
 
     def add_content(self, more_content: Any, no_docstring: bool = False) -> None:
@@ -1760,7 +1761,8 @@ class TypeVarDocumenter(DataDocumenter):
         return isinstance(member, TypeVar) and isattr  # type: ignore
 
     def add_directive_header(self, sig: str) -> None:
-        self.options.annotation = SUPPRESS  # type: ignore
+        self.options = Options(self.options)
+        self.options['annotation'] = SUPPRESS
         super().add_directive_header(sig)
 
     def get_doc(self, encoding: str = None, ignore: int = None) -> List[List[str]]: