diff --git a/src/calibre/gui2/viewer/ui.py b/src/calibre/gui2/viewer/ui.py
index 4650049bd8..3e1e9a7f42 100644
--- a/src/calibre/gui2/viewer/ui.py
+++ b/src/calibre/gui2/viewer/ui.py
@@ -372,6 +372,7 @@ class EbookViewer(MainWindow):
 
     def load_finished(self, ok, data):
         open_at, self.pending_open_at = self.pending_open_at, None
+        self.web_view.clear_caches()
         if not ok:
             self.setWindowTitle(self.base_window_title)
             tb = data['tb'].strip()
diff --git a/src/calibre/gui2/viewer/web_view.py b/src/calibre/gui2/viewer/web_view.py
index b67ad86fec..30a897fbf4 100644
--- a/src/calibre/gui2/viewer/web_view.py
+++ b/src/calibre/gui2/viewer/web_view.py
@@ -607,6 +607,9 @@ class WebView(RestartingWebEngineView):
     def clear_history(self):
         self._page.history().clear()
 
+    def clear_caches(self):
+        self._page.profile().clearHttpCache()
+
     def trigger_shortcut(self, which):
         self.execute_when_ready('trigger_shortcut', which)