diff --git a/src/calibre/gui2/ui.py b/src/calibre/gui2/ui.py
index 4667431d96..937b23b113 100644
--- a/src/calibre/gui2/ui.py
+++ b/src/calibre/gui2/ui.py
@@ -581,7 +581,6 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
         time.sleep(2)
         if mb is not None:
             mb.flush()
-        QApplication.processEvents()
         self.hide_windows()
         return True