diff --git a/src/calibre/gui2/tweak_book/preview.py b/src/calibre/gui2/tweak_book/preview.py
index 7db9afc9c4..983b22125c 100644
--- a/src/calibre/gui2/tweak_book/preview.py
+++ b/src/calibre/gui2/tweak_book/preview.py
@@ -373,7 +373,7 @@ class WebView(RestartingWebEngineView):
         return self._size_hint
 
     def refresh(self):
-        self.pageAction(QWebEnginePage.Reload).trigger()
+        self.pageAction(QWebEnginePage.ReloadAndBypassCache).trigger()
 
     def clear(self):
         self.setHtml(_(