diff --git a/src/calibre/gui2/store/stores/koobe_plugin.py b/src/calibre/gui2/store/stores/koobe_plugin.py
index 0b8ee8f719..d767a832cb 100644
--- a/src/calibre/gui2/store/stores/koobe_plugin.py
+++ b/src/calibre/gui2/store/stores/koobe_plugin.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from __future__ import (unicode_literals, division, absolute_import, print_function)
-store_version = 3  # Needed for dynamic plugin loading
+store_version = 4  # Needed for dynamic plugin loading
 
 __license__ = 'GPL 3'
 __copyright__ = '2013, Tomasz Długosz <tomek3d@gmail.com>'