diff --git a/stdlib/2/subprocess.pyi b/stdlib/2/subprocess.pyi
index b603e42c0..d9205b089 100644
--- a/stdlib/2/subprocess.pyi
+++ b/stdlib/2/subprocess.pyi
@@ -21,7 +21,7 @@ def call(args: _CMD,
          preexec_fn: Callable[[], Any] = ...,
          close_fds: bool = ...,
          shell: bool = ...,
-         cwd: _TXT = ...,
+         cwd: Optional[_TXT] = ...,
          env: _ENV = ...,
          universal_newlines: bool = ...,
          startupinfo: Any = ...,
@@ -36,7 +36,7 @@ def check_call(args: _CMD,
                preexec_fn: Callable[[], Any] = ...,
                close_fds: bool = ...,
                shell: bool = ...,
-               cwd: _TXT = ...,
+               cwd: Optional[_TXT] = ...,
                env: _ENV = ...,
                universal_newlines: bool = ...,
                startupinfo: Any = ...,
@@ -51,7 +51,7 @@ def check_output(args: _CMD,
                  preexec_fn: Callable[[], Any] = ...,
                  close_fds: bool = ...,
                  shell: bool = ...,
-                 cwd: _TXT = ...,
+                 cwd: Optional[_TXT] = ...,
                  env: _ENV = ...,
                  universal_newlines: bool = ...,
                  startupinfo: Any = ...,