diff --git a/lib/iev/db.rb b/lib/iev/db.rb
index 6ad882e..63b4254 100644
--- a/lib/iev/db.rb
+++ b/lib/iev/db.rb
@@ -55,7 +55,7 @@ def open_cache_biblio(dir, global: true)
       db = DbCache.new dir
       if global
         unless db.check_version?
-          FileUtils.rm_rf dir + "/."
+          FileUtils.rm_rf(Dir.glob(File.join(dir, '*')), secure: true)
           warn "Global cache version is obsolete and cleared."
         end
         db.set_version