diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index de7194ed75c2..27ee52e54d3d 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -185,10 +185,10 @@ class int:
     def bit_length(self) -> int: ...
     if sys.version_info >= (3, 10):
         def bit_count(self) -> int: ...
-    def to_bytes(self, length: int, byteorder: str, *, signed: bool = ...) -> bytes: ...
+    def to_bytes(self, length: int, byteorder: Literal["little", "big"], *, signed: bool = ...) -> bytes: ...
     @classmethod
     def from_bytes(
-        cls, bytes: Union[Iterable[int], SupportsBytes], byteorder: str, *, signed: bool = ...
+        cls, bytes: Union[Iterable[int], SupportsBytes], byteorder: Literal["little", "big"], *, signed: bool = ...
     ) -> int: ...  # TODO buffer object argument
     def __add__(self, x: int) -> int: ...
     def __sub__(self, x: int) -> int: ...
diff --git a/stdlib/sys.pyi b/stdlib/sys.pyi
index 49623565ddcf..5f0f4ab99534 100644
--- a/stdlib/sys.pyi
+++ b/stdlib/sys.pyi
@@ -22,6 +22,7 @@ from typing import (
     Union,
     overload,
 )
+from typing_extensions import Literal
 
 _T = TypeVar("_T")
 
@@ -43,7 +44,7 @@ if sys.platform != "win32":
 argv: List[str]
 base_exec_prefix: str
 base_prefix: str
-byteorder: str
+byteorder: Literal["little", "big"]
 builtin_module_names: Sequence[str]  # actually a tuple of strings
 copyright: str
 if sys.platform == "win32":