diff --git a/src/calibre/gui2/tweak_book/save.py b/src/calibre/gui2/tweak_book/save.py
index 6c89a75413..d1b2680ac5 100644
--- a/src/calibre/gui2/tweak_book/save.py
+++ b/src/calibre/gui2/tweak_book/save.py
@@ -33,6 +33,7 @@ class SaveWidget(QWidget):
         self.stop()
 
     def start(self):
+        self.pi.setDisplaySize(self.label.height())
         self.pi.setVisible(True)
         self.pi.startAnimation()
         self.label.setText(_('Saving...'))