diff --git a/addons/website_forum/controllers/main.py b/addons/website_forum/controllers/main.py
index 449ce6a758d..5d697e18e68 100644
--- a/addons/website_forum/controllers/main.py
+++ b/addons/website_forum/controllers/main.py
@@ -220,9 +220,8 @@ class WebsiteForum(http.Controller):
         except URLError:
             return False
 
-    @http.route(['''/forum/<model("forum.forum"):forum>/question/<model("forum.post", "[('forum_id','=',forum[0]),('parent_id','=',False)]"):question>'''], type='http', auth="public", website=True)
+    @http.route(['''/forum/<model("forum.forum"):forum>/question/<model("forum.post", "[('forum_id','=',forum[0]),('parent_id','=',False),('can_view', '=', True)]"):question>'''], type='http', auth="public", website=True)
     def question(self, forum, question, **post):
-
         # Hide posts from abusers (negative karma), except for moderators
         if not question.can_view:
             raise werkzeug.exceptions.NotFound()
diff --git a/addons/website_forum/models/forum.py b/addons/website_forum/models/forum.py
index 2f6b6d4b844..78c486a9ddc 100644
--- a/addons/website_forum/models/forum.py
+++ b/addons/website_forum/models/forum.py
@@ -265,12 +265,34 @@ class Post(models.Model):
     can_downvote = fields.Boolean('Can Downvote', compute='_get_post_karma_rights')
     can_comment = fields.Boolean('Can Comment', compute='_get_post_karma_rights')
     can_comment_convert = fields.Boolean('Can Convert to Comment', compute='_get_post_karma_rights')
-    can_view = fields.Boolean('Can View', compute='_get_post_karma_rights')
+    can_view = fields.Boolean('Can View', compute='_get_post_karma_rights', search='_search_can_view')
     can_display_biography = fields.Boolean("Is the author's biography visible from his post", compute='_get_post_karma_rights')
     can_post = fields.Boolean('Can Automatically be Validated', compute='_get_post_karma_rights')
     can_flag = fields.Boolean('Can Flag', compute='_get_post_karma_rights')
     can_moderate = fields.Boolean('Can Moderate', compute='_get_post_karma_rights')
 
+    def _search_can_view(self, operator, value):
+        if operator not in ('=', '!=', '<>'):
+            raise ValueError('Invalid operator: %s' % (operator,))
+
+        is_admin = self._uid == SUPERUSER_ID
+        if is_admin:
+            return [(1, '=', 1)]
+
+        user = self.env['res.users'].browse(self._uid)
+        req = """
+            SELECT p.id
+            FROM forum_post p
+                   LEFT JOIN res_users u ON p.create_uid = u.id
+                   LEFT JOIN forum_forum f ON p.forum_id = f.id
+            WHERE
+                u.karma > 0
+                or (p.create_uid = %s and f.karma_close_own <= %s)
+                or (p.create_uid != %s and f.karma_close_all <= %s)
+        """
+        # don't use param named because orm will add other param (test_active, ...)
+        return [('id', '%sselect' % (operator == "=" and "in" or "not in"), (req, (user.id, user.karma, user.id, user.karma)))]
+
     @api.one
     @api.depends('content')
     def _get_plain_content(self):
diff --git a/openerp/osv/expression.py b/openerp/osv/expression.py
index d30b6a943cd..47b941485b2 100644
--- a/openerp/osv/expression.py
+++ b/openerp/osv/expression.py
@@ -907,7 +907,7 @@ class expression(object):
                     push(leaf)
                 else:
                     for elem in reversed(domain):
-                        push(create_substitution_leaf(leaf, elem, model))
+                        push(create_substitution_leaf(leaf, elem, model, internal=True))
 
             # -------------------------------------------------
             # FUNCTION FIELD