diff --git a/stdlib/subprocess.pyi b/stdlib/subprocess.pyi
index fded3f74928e..25b988adc52d 100644
--- a/stdlib/subprocess.pyi
+++ b/stdlib/subprocess.pyi
@@ -1828,8 +1828,8 @@ class TimeoutExpired(SubprocessError):
     timeout: float
     # morally: _TXT | None
     output: Any
-    stdout: Any
-    stderr: Any
+    stdout: bytes | None
+    stderr: bytes | None
 
 class CalledProcessError(SubprocessError):
     returncode: int