diff --git a/stdlib/2and3/aifc.pyi b/stdlib/2and3/aifc.pyi
index c2fd608de..61e31a9ed 100644
--- a/stdlib/2and3/aifc.pyi
+++ b/stdlib/2and3/aifc.pyi
@@ -71,15 +71,15 @@ class Aifc_write:
     def close(self) -> None: ...
 
 @overload
-def open(f: _File, mode: Literal["r", "rb"] = ...) -> Aifc_read: ...
+def open(f: _File, mode: Literal["r", "rb"]) -> Aifc_read: ...
 @overload
 def open(f: _File, mode: Literal["w", "wb"]) -> Aifc_write: ...
 @overload
-def open(f: _File, mode: str) -> Any: ...
+def open(f: _File, mode: Optional[str] = ...) -> Any: ...
 
 @overload
-def openfp(f: _File, mode: Literal["r", "rb"] = ...) -> Aifc_read: ...
+def openfp(f: _File, mode: Literal["r", "rb"]) -> Aifc_read: ...
 @overload
 def openfp(f: _File, mode: Literal["w", "wb"]) -> Aifc_write: ...
 @overload
-def openfp(f: _File, mode: str) -> Any: ...
+def openfp(f: _File, mode: Optional[str] = ...) -> Any: ...
diff --git a/tests/stubtest_whitelists/py3_common.txt b/tests/stubtest_whitelists/py3_common.txt
index 10365662c..a9ad30b2b 100644
--- a/tests/stubtest_whitelists/py3_common.txt
+++ b/tests/stubtest_whitelists/py3_common.txt
@@ -11,8 +11,6 @@ _weakref.ReferenceType.__call__
 abc.abstractclassmethod
 abc.abstractmethod
 abc.abstractstaticmethod
-aifc.open
-aifc.openfp
 argparse.Namespace.__getattr__
 asyncio.BaseEventLoop.subprocess_exec
 asyncio.Condition.acquire