diff --git a/stdlib/3/importlib/util.pyi b/stdlib/3/importlib/util.pyi
index 3daff276e..d488630b9 100644
--- a/stdlib/3/importlib/util.pyi
+++ b/stdlib/3/importlib/util.pyi
@@ -26,7 +26,7 @@ if sys.version_info >= (3, 4):
     def decode_source(source_bytes: bytes) -> str: ...
     def find_spec(
         name: str, package: Optional[str] = ...
-    ) -> importlib.machinery.ModuleSpec: ...
+    ) -> Optional[importlib.machinery.ModuleSpec]: ...
     def spec_from_loader(
         name: str, loader: Optional[importlib.abc.Loader], *,
         origin: Optional[str] = ..., loader_state: Optional[Any] = ...,