diff --git a/openerp/addons/base/ir/ir_ui_view.py b/openerp/addons/base/ir/ir_ui_view.py
index 2e74f116223..fc0edc24676 100644
--- a/openerp/addons/base/ir/ir_ui_view.py
+++ b/openerp/addons/base/ir/ir_ui_view.py
@@ -311,7 +311,11 @@ class view(osv.osv):
         user = self.pool['res.users'].browse(cr, 1, uid, context=context)
         user_groups = frozenset(user.groups_id or ())
 
-        conditions = [['inherit_id', '=', view_id], ['model', '=', model]]
+        conditions = [
+            ['inherit_id', '=', view_id],
+            ['model', '=', model],
+            ['mode', '=', 'extension'],
+        ]
         if self.pool._init:
             # Module init currently in progress, only consider views from
             # modules whose code is already loaded
diff --git a/openerp/addons/base/tests/test_views.py b/openerp/addons/base/tests/test_views.py
index 180bb6bff8a..07cd4715b83 100644
--- a/openerp/addons/base/tests/test_views.py
+++ b/openerp/addons/base/tests/test_views.py
@@ -965,6 +965,14 @@ class TestViewCombined(ViewCase):
             'inherit_id': self.a1,
             'arch': '<xpath expr="//a1" position="after"><a3/></xpath>'
         })
+        # mode=primary should be an inheritance boundary in both direction,
+        # even within a model it should not extend the parent
+        self.a4 = self.create({
+            'model': 'a',
+            'inherit_id': self.a1,
+            'mode': 'primary',
+            'arch': '<xpath expr="//a1" position="after"><a4/></xpath>',
+        })
 
         self.b1 = self.create({
             'model': 'b',
@@ -1031,6 +1039,17 @@ class TestViewCombined(ViewCase):
                 E.a2(),
             ), arch)
 
+    def test_read_from_child_primary(self):
+        arch = self.read_combined(self.a4)['arch']
+        self.assertEqual(
+            ET.fromstring(arch),
+            E.qweb(
+                E.a1(),
+                E.a4(),
+                E.a3(),
+                E.a2(),
+            ), arch)
+
     def test_cross_model_simple(self):
         arch = self.read_combined(self.c2)['arch']
         self.assertEqual(