diff --git a/stdlib/2and3/pkgutil.pyi b/stdlib/2and3/pkgutil.pyi
index e6d467245..88461524a 100644
--- a/stdlib/2and3/pkgutil.pyi
+++ b/stdlib/2and3/pkgutil.pyi
@@ -28,4 +28,4 @@ def iter_modules(path: Optional[List[str]] = ...,
                  prefix: str = ...) -> _YMFNI: ...  # TODO precise type
 def walk_packages(path: Optional[str] = ..., prefix: str = ...,
                   onerror: Optional[Callable[[str], None]] = ...) -> _YMFNI: ...
-def get_data(package: str, resource: str) -> bytes: ...
+def get_data(package: str, resource: str) -> Optional[bytes]: ...