diff --git a/configuration.py b/configuration.py
index a51d479..a33ef48 100644
--- a/configuration.py
+++ b/configuration.py
@@ -5,10 +5,10 @@ from trytond.model import fields
 from trytond.pool import PoolMeta
 
 __all__ = ['Configuration']
-__metaclass__ = PoolMeta
 
 
 class Configuration:
+    __metaclass__ = PoolMeta
     __name__ = 'galatea.configuration'
     tutorial_thumb_size = fields.Integer('Tutorial Thumb Size',
         help='Thumbnail Tutorial Image Size (width x height)')
diff --git a/galatea.py b/galatea.py
index 37b6674..4c4b9ad 100644
--- a/galatea.py
+++ b/galatea.py
@@ -6,10 +6,10 @@ from trytond.model import fields
 from trytond.pyson import Eval
 
 __all__ = ['GalateaWebSite']
-__metaclass__ = PoolMeta
 
 
 class GalateaWebSite:
+    __metaclass__ = PoolMeta
     __name__ = "galatea.website"
     tutorial_comment = fields.Boolean('Tutorial Comments',
         help='Active tutorial comments.')