diff --git a/stdlib/3/http/client.pyi b/stdlib/3/http/client.pyi
index f3f48402b..e59497160 100644
--- a/stdlib/3/http/client.pyi
+++ b/stdlib/3/http/client.pyi
@@ -97,7 +97,7 @@ if sys.version_info >= (3, 5):
         def getheader(self, name: str, default: _T) -> Union[str, _T]: ...
         def getheaders(self) -> List[Tuple[str, str]]: ...
         def fileno(self) -> int: ...
-        def isclosed(self): bool
+        def isclosed(self) -> bool: ...
         def __iter__(self) -> Iterator[bytes]: ...
         def __enter__(self) -> 'HTTPResponse': ...
         def __exit__(self, exc_type: Optional[type],