diff --git a/stdlib/2/subprocess.pyi b/stdlib/2/subprocess.pyi
index be9636d9a..69fa50467 100644
--- a/stdlib/2/subprocess.pyi
+++ b/stdlib/2/subprocess.pyi
@@ -21,7 +21,7 @@ def call(
     close_fds: bool = ...,
     shell: bool = ...,
     cwd: Optional[_TXT] = ...,
-    env: _ENV = ...,
+    env: Optional[_ENV] = ...,
     universal_newlines: bool = ...,
     startupinfo: Any = ...,
     creationflags: int = ...,
@@ -37,7 +37,7 @@ def check_call(
     close_fds: bool = ...,
     shell: bool = ...,
     cwd: Optional[_TXT] = ...,
-    env: _ENV = ...,
+    env: Optional[_ENV] = ...,
     universal_newlines: bool = ...,
     startupinfo: Any = ...,
     creationflags: int = ...,
@@ -54,7 +54,7 @@ def check_output(
     close_fds: bool = ...,
     shell: bool = ...,
     cwd: Optional[_TXT] = ...,
-    env: _ENV = ...,
+    env: Optional[_ENV] = ...,
     universal_newlines: bool = ...,
     startupinfo: Any = ...,
     creationflags: int = ...,