diff --git a/stdlib/2and3/difflib.pyi b/stdlib/2and3/difflib.pyi
index a2c3955b4..f948fe5f0 100644
--- a/stdlib/2and3/difflib.pyi
+++ b/stdlib/2and3/difflib.pyi
@@ -34,7 +34,7 @@ class SequenceMatcher(Generic[_T]):
     def get_matching_blocks(self) -> List[Match]: ...
     def get_opcodes(self) -> List[Tuple[str, int, int, int, int]]: ...
     def get_grouped_opcodes(self, n: int = ...
-                            ) -> Iterable[Tuple[str, int, int, int, int]]: ...
+                            ) -> Iterable[List[Tuple[str, int, int, int, int]]]: ...
     def ratio(self) -> float: ...
     def quick_ratio(self) -> float: ...
     def real_quick_ratio(self) -> float: ...