diff --git a/stdlib/3/email/policy.pyi b/stdlib/3/email/policy.pyi
index c5abb862e..2ddb290b7 100644
--- a/stdlib/3/email/policy.pyi
+++ b/stdlib/3/email/policy.pyi
@@ -19,7 +19,7 @@ class Policy:
     def register_defect(self, obj: Message, defect: MessageDefect) -> None: ...
     def header_max_count(self, name: str) -> Optional[int]: ...
     @abstractmethod
-    def header_source_parse(self, sourcelines: List[str]) -> str: ...
+    def header_source_parse(self, sourcelines: List[str]) -> Tuple[str, str]: ...
     @abstractmethod
     def header_store_parse(self, name: str, value: str) -> Tuple[str, str]: ...
     @abstractmethod
@@ -30,7 +30,7 @@ class Policy:
     def fold_binary(self, name: str, value: str) -> bytes: ...
 
 class Compat32(Policy):
-    def header_source_parse(self, sourcelines: List[str]) -> str: ...
+    def header_source_parse(self, sourcelines: List[str]) -> Tuple[str, str]: ...
     def header_store_parse(self, name: str, value: str) -> Tuple[str, str]: ...
     def header_fetch_parse(self, name: str, value: str) -> Union[str, Header]: ...  # type: ignore
     def fold(self, name: str, value: str) -> str: ...
@@ -43,7 +43,7 @@ class EmailPolicy(Policy):
     refold_source: str
     header_factory: Callable[[str, str], str]
     content_manager: ContentManager
-    def header_source_parse(self, sourcelines: List[str]) -> str: ...
+    def header_source_parse(self, sourcelines: List[str]) -> Tuple[str, str]: ...
     def header_store_parse(self, name: str, value: str) -> Tuple[str, str]: ...
     def header_fetch_parse(self, name: str, value: str) -> str: ...
     def fold(self, name: str, value: str) -> str: ...