diff --git a/desktop/onionshare/main_window.py b/desktop/onionshare/main_window.py
index 8ebde01e..986f8720 100644
--- a/desktop/onionshare/main_window.py
+++ b/desktop/onionshare/main_window.py
@@ -314,6 +314,6 @@ class MainWindow(QtWidgets.QMainWindow):
         # Wait 1 second for threads to close gracefully, so tests finally pass
         time.sleep(1)
 
-    def resizeEvent(self, event):
+    def resizeEvent(self, event: QtGui.QResizeEvent):
         self.window_resized.emit()
         return super(MainWindow, self).resizeEvent(event)