diff --git a/src/calibre/ebooks/metadata/sources/search_engines.py b/src/calibre/ebooks/metadata/sources/search_engines.py
index d999fc0f91..67923f3801 100644
--- a/src/calibre/ebooks/metadata/sources/search_engines.py
+++ b/src/calibre/ebooks/metadata/sources/search_engines.py
@@ -88,7 +88,7 @@ def wayback_machine_cached_url(url, br=None, log=prints, timeout=60):
     try:
         closest = data['archived_snapshots']['closest']
         if closest['available']:
-            return closest['url']
+            return closest['url'].replace('http:', 'https:')
     except Exception:
         pass
     from pprint import pformat