diff --git a/stdlib/os/__init__.pyi b/stdlib/os/__init__.pyi
index 76c114591d32..06f73e618180 100644
--- a/stdlib/os/__init__.pyi
+++ b/stdlib/os/__init__.pyi
@@ -861,7 +861,12 @@ class _wrap_close(_TextIOWrapper):
     def __init__(self, stream: _TextIOWrapper, proc: Popen[str]) -> None: ...
     def close(self) -> int | None: ...  # type: ignore[override]
 
-def popen(cmd: str, mode: str = ..., buffering: int = ...) -> _wrap_close: ...
+if sys.version_info >= (3, 11):
+    def popen(cmd: str, mode: str = ..., buffering: int = ..., encoding: str | None = ...) -> _wrap_close: ...
+
+else:
+    def popen(cmd: str, mode: str = ..., buffering: int = ...) -> _wrap_close: ...
+
 def spawnl(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: StrOrBytesPath) -> int: ...
 def spawnle(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: Any) -> int: ...  # Imprecise sig