diff --git a/trytond/model/__init__.py b/trytond/model/__init__.py
index 2d845c6aa3..54e9620923 100644
--- a/trytond/model/__init__.py
+++ b/trytond/model/__init__.py
@@ -12,5 +12,6 @@ from .union import UnionMixin
 from .descriptors import dualmethod
 
 __all__ = ['Model', 'ModelView', 'ModelStorage', 'ModelSingleton', 'ModelSQL',
+    'Check', 'Unique',
     'Workflow', 'DictSchemaMixin', 'MatchMixin', 'UnionMixin', 'dualmethod',
     'EvalEnvironment']