diff --git a/backup_imap/backup_imap.py b/backup_imap/backup_imap.py
index c2a4d03..589221f 100644
--- a/backup_imap/backup_imap.py
+++ b/backup_imap/backup_imap.py
@@ -303,9 +303,11 @@ class BackupImap:
                         cached_data['last_update'] + self.config['max_cache_age'] > time.time()
                     ):
                         self._log.debug(
-                            "Data in cache file '%s' is too old (%s), initializing cache data.",
+                            "Data in cache file '%s' is too old (%s + %s > %s), initializing cache data.",
                             self.config['cache_file'],
-                            cached_data['last_update']
+                            cached_data['last_update'],
+                            self.config['max_cache_age'],
+                            time.time()
                         )
                         cached_data = self._default_data
                 except json.decoder.JSONDecodeError: