diff --git a/qutebrowser/mainwindow/mainwindow.py b/qutebrowser/mainwindow/mainwindow.py
index 6bfae1589..846020b86 100644
--- a/qutebrowser/mainwindow/mainwindow.py
+++ b/qutebrowser/mainwindow/mainwindow.py
@@ -416,8 +416,7 @@ class MainWindow(QWidget):
                 e.ignore()
                 return
         e.accept()
-        if len(objreg.window_registry) == 1:
-            objreg.get('session-manager').save_last_window_session()
+        objreg.get('session-manager').save_last_window_session()
         self._save_geometry()
         log.destroy.debug("Closing window {}".format(self.win_id))
         self._tabbed_browser.shutdown()