diff --git a/plugins/coverbrowser.koplugin/bookinfomanager.lua b/plugins/coverbrowser.koplugin/bookinfomanager.lua
index f4f9f3a6e..ef7342266 100644
--- a/plugins/coverbrowser.koplugin/bookinfomanager.lua
+++ b/plugins/coverbrowser.koplugin/bookinfomanager.lua
@@ -308,8 +308,9 @@ function BookInfoManager:extractBookInfo(filepath, cover_specs)
         -- cre.initCache("", 1024*1024*32) -- empty path = no cache
         -- But it's best to use a cache for quicker and less memory
         -- usage when opening big books:
+        local default_cre_storage_size_factor = 20 -- note: keep in sync with the one in credocument.lua
         cre.initCache(self.tmpcr3cache, 0, -- 0 = previous book caches are removed when opening a book
-            true, G_reader_settings:readSetting("cre_storage_size_factor")) -- avoid CRE WARNINGs
+            true, G_reader_settings:readSetting("cre_storage_size_factor") or default_cre_storage_size_factor)
         self.cre_cache_overriden = true
     end