diff --git a/openerp/fields.py b/openerp/fields.py
index bc9d4f7c7b0..95578e9812e 100644
--- a/openerp/fields.py
+++ b/openerp/fields.py
@@ -1972,6 +1972,7 @@ class Many2many(_RelationalMulti):
         'relation': None,               # name of table
         'column1': None,                # column of table referring to model
         'column2': None,                # column of table referring to comodel
+        'auto_join': False,             # whether joins are generated upon search
         'limit': None,                  # optional limit to use upon read
     }
 
@@ -2014,6 +2015,7 @@ class Many2many(_RelationalMulti):
     _column_rel = property(attrgetter('relation'))
     _column_id1 = property(attrgetter('column1'))
     _column_id2 = property(attrgetter('column2'))
+    _column_auto_join = property(attrgetter('auto_join'))
     _column_limit = property(attrgetter('limit'))
 
 
diff --git a/openerp/osv/fields.py b/openerp/osv/fields.py
index c4a2a0706e5..190272aa27d 100644
--- a/openerp/osv/fields.py
+++ b/openerp/osv/fields.py
@@ -947,6 +947,7 @@ class many2many(_column):
         args['relation'] = self._rel
         args['column1'] = self._id1
         args['column2'] = self._id2
+        args['auto_join'] = self._auto_join
         args['limit'] = self._limit
         return args