diff --git a/partner_firstname/models/res_user.py b/partner_firstname/models/res_user.py
index 5b0f7c8fc..efe6f9a9f 100644
--- a/partner_firstname/models/res_user.py
+++ b/partner_firstname/models/res_user.py
@@ -28,3 +28,10 @@ class ResUser(models.Model):
                 result[field] = inverted.get(field)
 
         return result
+
+    @api.onchange("firstname", "lastname")
+    def _compute_name(self):
+        """Write the 'name' field according to splitted data."""
+        for rec in self:
+            rec.name = rec.partner_id._get_computed_name(
+                rec.lastname, rec.firstname)
diff --git a/partner_firstname/tests/__init__.py b/partner_firstname/tests/__init__.py
index 2692c082c..1fed38100 100644
--- a/partner_firstname/tests/__init__.py
+++ b/partner_firstname/tests/__init__.py
@@ -8,5 +8,6 @@ from . import (
     test_delete,
     test_empty,
     test_name,
-    test_onchange
+    test_onchange,
+    test_user_onchange
 )
diff --git a/partner_firstname/tests/test_user_onchange.py b/partner_firstname/tests/test_user_onchange.py
new file mode 100644
index 000000000..46fe41b74
--- /dev/null
+++ b/partner_firstname/tests/test_user_onchange.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+# © 2016 Yannick Vaucher (Camptocamp SA)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from openerp.tests.common import TransactionCase
+
+
+class UserOnchangeCase(TransactionCase):
+
+    def test_create_from_form_only_firstname(self):
+        """In a new users form, a user set only the firstname."""
+        firstname = u"Zoë"
+        with self.env.do_in_onchange():
+            # Changes firstname, which triggers onchanges
+            self.user.firstname = firstname
+            self.user._compute_name()
+
+            self.assertEqual(self.user.lastname, False)
+            self.assertEqual(self.user.firstname, firstname)
+            self.assertEqual(self.user.name, firstname)
+
+    def test_create_from_form_only_lastname(self):
+        """In a new user form, a user set only the lastname."""
+        lastname = u"Żywioł"
+        with self.env.do_in_onchange():
+            # Changes lastname, which triggers onchanges
+            self.user.lastname = lastname
+            self.user._compute_name()
+
+            self.assertEqual(self.user.firstname, False)
+            self.assertEqual(self.user.lastname, lastname)
+            self.assertEqual(self.user.name, lastname)
+
+    def test_create_from_form_all(self):
+        """In a new user form, a user set all names."""
+        firstname = u"Zoë"
+        lastname = u"Żywioł"
+        with self.env.do_in_onchange():
+            # Changes firstname, which triggers onchanges
+            self.user.firstname = firstname
+            self.user._compute_name()
+
+            # Changes lastname, which triggers onchanges
+            self.user.lastname = lastname
+            self.user._compute_name()
+
+            self.assertEqual(self.user.lastname, lastname)
+            self.assertEqual(self.user.firstname, firstname)
+            self.assertEqual(self.user.name, u" ".join((lastname, firstname)))
+
+    def setUp(self):
+        super(UserOnchangeCase, self).setUp()
+        self.user = self.env["res.users"].new()