diff --git a/PyQt5-stubs/QtWidgets.pyi b/PyQt5-stubs/QtWidgets.pyi
index 0c683ba1..0ec7a4bc 100644
--- a/PyQt5-stubs/QtWidgets.pyi
+++ b/PyQt5-stubs/QtWidgets.pyi
@@ -6820,7 +6820,7 @@ class QProgressDialog(QDialog):
     def minimum(self) -> int: ...
     def wasCanceled(self) -> bool: ...
     def setBar(self, bar: QProgressBar) -> None: ...
-    def setCancelButton(self, button: QPushButton) -> None: ...
+    def setCancelButton(self, button: typing.Optional[QPushButton]) -> None: ...
     def setLabel(self, label: QLabel) -> None: ...