diff --git a/stdlib/3/os/__init__.pyi b/stdlib/3/os/__init__.pyi
index eee6d19843b8..612ce7c4a4f2 100644
--- a/stdlib/3/os/__init__.pyi
+++ b/stdlib/3/os/__init__.pyi
@@ -362,8 +362,8 @@ if sys.platform != 'win32':
         def readv(fd: int, buffers: Sequence[bytearray]) -> int: ...
         def writev(fd: int, buffers: Sequence[bytes]) -> int: ...
 
-    terminal_size = NamedTuple('terminal_size', [('columns', int), ('lines', int)])
-    def get_terminal_size(fd: int = ...) -> terminal_size: ...
+terminal_size = NamedTuple('terminal_size', [('columns', int), ('lines', int)])
+def get_terminal_size(fd: int = ...) -> terminal_size: ...
 
 if sys.version_info >= (3, 4):
     def get_inheritable(fd: int) -> bool: ...