diff --git a/src/local_ops.py b/src/local_ops.py
index 0c98701..9bddd57 100644
--- a/src/local_ops.py
+++ b/src/local_ops.py
@@ -509,7 +509,7 @@ def popen(
         stdin: typing.Optional[T_OS_IO_ID] = subprocess.PIPE,
         stdout: typing.Optional[T_OS_IO_ID] = subprocess.PIPE,
         stderr: typing.Optional[T_OS_IO_ID] = subprocess.PIPE,
-        exec_env: typing.Optional[dict] = None,
+        exec_env: typing.Optional[OsOperations.T_EXEC_ENV] = None,
         cwd: typing.Optional[str] = None
     ) -> OsProcessController:
         assert text is None or type(text) is bool
diff --git a/src/remote_ops.py b/src/remote_ops.py
index 3bb07a1..7fc9591 100644
--- a/src/remote_ops.py
+++ b/src/remote_ops.py
@@ -544,7 +544,7 @@ def popen(
         stdin: typing.Optional[T_OS_IO_ID] = subprocess.PIPE,
         stdout: typing.Optional[T_OS_IO_ID] = subprocess.PIPE,
         stderr: typing.Optional[T_OS_IO_ID] = subprocess.PIPE,
-        exec_env: typing.Optional[dict] = None,
+        exec_env: typing.Optional[OsOperations.T_EXEC_ENV] = None,
         cwd: typing.Optional[str] = None
     ) -> OsProcessController:
         assert type(cmd) is str or type(cmd) is list