diff --git a/stdlib/2and3/imghdr.pyi b/stdlib/2and3/imghdr.pyi
index 3d6f660f2..b9d8d17e3 100644
--- a/stdlib/2and3/imghdr.pyi
+++ b/stdlib/2and3/imghdr.pyi
@@ -12,5 +12,5 @@ else:
 @overload
 def what(file: _File) -> Optional[str]: ...
 @overload
-def what(file: Any, h: bytes)-> Optional[str]: ...
+def what(file: Any, h: bytes) -> Optional[str]: ...
 tests: List[Callable[[bytes, BinaryIO], Optional[str]]]