diff --git a/trytond/model/modelsql.py b/trytond/model/modelsql.py
index 8721cda5eb..f5320e3530 100644
--- a/trytond/model/modelsql.py
+++ b/trytond/model/modelsql.py
@@ -347,7 +347,7 @@ class ModelSQL(ModelStorage):
                     if field.required and \
                             not hasattr(field, 'set') and \
                             field_name not in ('create_uid', 'create_date'):
-                        if not values.get(field_name):
+                        if values.get(field_name) is None:
                             cls.raise_user_error('required_field',
                                     error_args=cls._get_error_args(
                                         field_name))
diff --git a/trytond/test/__init__.py b/trytond/test/__init__.py
index b6378c528f..75d50d1076 100644
--- a/trytond/test/__init__.py
+++ b/trytond/test/__init__.py
@@ -89,6 +89,7 @@ def register():
         ModelInheritsSubSubModel,
         ModelInheritsSubSubSubModel,
         ModelInheritsOverriddenFieldModel,
+        ModelSQLRequiredField,
         MPTT,
         ImportDataBoolean,
         ImportDataInteger,
diff --git a/trytond/test/model.py b/trytond/test/model.py
index 24d2bd2380..ff5a006cad 100644
--- a/trytond/test/model.py
+++ b/trytond/test/model.py
@@ -5,7 +5,7 @@ from trytond.model import ModelSingleton, ModelSQL, fields
 __all__ = [
     'Singleton', 'URLObject', 'ModelInherits', 'ModelInheritsSubModel',
     'ModelInheritsSubSubModel', 'ModelInheritsSubSubSubModel',
-    'ModelInheritsOverriddenFieldModel',
+    'ModelInheritsOverriddenFieldModel', 'ModelSQLRequiredField'
     ]
 
 
@@ -70,3 +70,11 @@ class ModelInheritsOverriddenFieldModel(ModelSQL):
     subfield = fields.Integer('Overridden field')
     parent_model = fields.Many2One('test.subsubmodel', 'Parent model',
         required=True)
+
+
+class ModelSQLRequiredField(ModelSQL):
+    'model with a required field'
+    __name__ = 'test.modelsql'
+
+    integer = fields.Integer(string="integer", required=True)
+    desc = fields.Char(string="desc", required=True)
diff --git a/trytond/tests/test_modelsql.py b/trytond/tests/test_modelsql.py
new file mode 100644
index 0000000000..55c526b384
--- /dev/null
+++ b/trytond/tests/test_modelsql.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# This file is part of Tryton.  The COPYRIGHT file at the top level of this
+# repository contains the full copyright notices and license terms.
+
+import unittest
+
+from trytond.config import CONFIG
+from trytond.exceptions import UserError
+from trytond.transaction import Transaction
+from trytond.tests.test_tryton import POOL, DB_NAME, USER, CONTEXT, \
+    install_module
+
+class ModelSQLTestCase(unittest.TestCase):
+    '''
+    Test ModelSQL
+    '''
+
+    def setUp(self):
+        install_module('test')
+        self.modelsql = POOL.get('test.modelsql')
+
+    # SQLite not concerned because tryton don't set "NOT NULL" constraint:
+    # 'ALTER TABLE' don't support NOT NULL constraint without default value
+    @unittest.skipIf(CONFIG['db_type'] not in ('postgresql', 'mysql'),
+            'postgresql or mysql needed')
+    def test0010required_field_missing(self):
+        '''
+        Test error message when a required field is missing.
+        '''
+        fields = {
+            'desc': '',
+            'integer': 0,
+            }
+        for key, value in fields.iteritems():
+            with Transaction().start(DB_NAME, USER, context=CONTEXT):
+                try:
+                    self.modelsql.create({key: value})
+                except UserError, err:
+                    # message must not quote key
+                    msg = "'%s' not missing but quoted in error: '%s'" % (key,
+                            err.message)
+                    self.assertTrue(key not in err.message, msg)
+                    continue
+                self.fail('UserError should be caught')
+
+def suite():
+    return unittest.TestLoader().loadTestsFromTestCase(ModelSQLTestCase)
+
+if __name__ == '__main__':
+    unittest.TextTestRunner(verbosity=2).run(suite())
diff --git a/trytond/tests/test_tryton.py b/trytond/tests/test_tryton.py
index 6a95bb04a7..4fc11769c9 100644
--- a/trytond/tests/test_tryton.py
+++ b/trytond/tests/test_tryton.py
@@ -255,6 +255,8 @@ def all_suite():
     suite_.addTests(test_wizard.suite())
     import trytond.tests.test_model_inherits as test_inherits
     suite_.addTests(test_inherits.suite())
+    import trytond.tests.test_modelsql as test_modelsql
+    suite_.addTests(test_modelsql.suite())
     return suite_