diff --git a/modules/product_attribute/message.xml b/modules/product_attribute/message.xml
index 69faa09f32..f3534aadd5 100644
--- a/modules/product_attribute/message.xml
+++ b/modules/product_attribute/message.xml
@@ -6,5 +6,8 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.message" id="msg_label_value">
             <field name="text">%(label)s: %(value)s</field>
         </record>
+        <record model="ir.message" id="msg_product_attribute_name_unique">
+            <field name="text">The name of the product attribute must be unique.</field>
+        </record>
     </data>
 </tryton>
diff --git a/modules/product_attribute/product.py b/modules/product_attribute/product.py
index a6eacd5752..0a77e25927 100644
--- a/modules/product_attribute/product.py
+++ b/modules/product_attribute/product.py
@@ -1,7 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from trytond.i18n import gettext
-from trytond.model import DictSchemaMixin, ModelSQL, ModelView, fields
+from trytond.model import DictSchemaMixin, ModelSQL, ModelView, Unique, fields
 from trytond.pool import PoolMeta
 from trytond.pyson import Eval
 
@@ -21,6 +21,15 @@ class Attribute(DictSchemaMixin, ModelSQL, ModelView):
         'attribute', 'attribute_set', 'Sets',
         help="Add sets to the attribute.")
 
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        t = cls.__table__()
+        cls._sql_constraints += [
+            ('name_unique', Unique(t, t.name),
+                'product_attribute.msg_product_attribute_name_unique'),
+            ]
+
 
 class AttributeAttributeSet(ModelSQL):
     __name__ = 'product.attribute-product.attribute-set'