diff --git a/PyQt5-stubs/QtCore.pyi b/PyQt5-stubs/QtCore.pyi
index 5030179..9ed38cd 100644
--- a/PyQt5-stubs/QtCore.pyi
+++ b/PyQt5-stubs/QtCore.pyi
@@ -56,10 +56,10 @@ class pyqtSignal:
     def __init__(self, *types: typing.Any, name: str = ...) -> None: ...
 
     @typing.overload
-    def __get__(self, instance: None, owner: typing.Type["QObject"]) -> "pyqtSignal": ...
+    def __get__(self, instance: None, owner: typing.Optional[typing.Type["QObject"]]) -> "pyqtSignal": ...
 
     @typing.overload
-    def __get__(self, instance: "QObject", owner: typing.Type["QObject"]) -> pyqtBoundSignal: ...
+    def __get__(self, instance: "QObject", owner: typing.Optional[typing.Type["QObject"]]) -> pyqtBoundSignal: ...
 
 
 # Convenient type aliases.