diff --git a/addons/stock/product.py b/addons/stock/product.py
index 2c2a6ce79db..15c8269eef5 100644
--- a/addons/stock/product.py
+++ b/addons/stock/product.py
@@ -583,7 +583,7 @@ class product_category(osv.osv):
         return res
 
     _columns = {
-        'route_ids': fields.many2many('stock.location.route', 'stock_location_route_categ', 'categ_id', 'route_id', 'Routes', domain="[('product_categ_selectable', '=', True)]"),
+        'route_ids': fields.many2many('stock.location.route', 'stock_location_route_categ', 'categ_id', 'route_id', 'Routes', domain=[('product_categ_selectable', '=', True)]),
         'removal_strategy_id': fields.many2one('product.removal', 'Force Removal Strategy', help="Set a specific removal strategy that will be used regardless of the source location for this product category"),
         'total_route_ids': fields.function(calculate_total_routes, relation='stock.location.route', type='many2many', string='Total routes', readonly=True),
     }