diff --git a/trytond/model/modelsql.py b/trytond/model/modelsql.py
index 5bd72ab17f..5536a70681 100644
--- a/trytond/model/modelsql.py
+++ b/trytond/model/modelsql.py
@@ -539,7 +539,7 @@ class ModelSQL(ModelStorage):
                         '%s,%s' % (cls.__name__, id_))
                 except KeyError:
                     continue
-                sql_type = fields.Numeric('timestamp').sql_type().base
+                sql_type = fields.Float('timestamp').sql_type().base
                 where.append((table.id == id_)
                     & (Extract('EPOCH',
                             Coalesce(table.write_date, table.create_date)
diff --git a/trytond/tests/test_modelsql.py b/trytond/tests/test_modelsql.py
index 18c72238cd..5c8b079eac 100644
--- a/trytond/tests/test_modelsql.py
+++ b/trytond/tests/test_modelsql.py
@@ -293,6 +293,7 @@ class ModelSQLTestCase(unittest.TestCase):
             # timestamp precision of sqlite is the second
             time.sleep(1)
 
+        transaction.timestamp[str(record)] = timestamp
         ModelsqlTimestamp.write([record], {})
         transaction.commit()