diff --git a/addons/product/product.py b/addons/product/product.py
index a5eee93b0e3..1197e9c318c 100644
--- a/addons/product/product.py
+++ b/addons/product/product.py
@@ -1040,7 +1040,9 @@ class product_product(osv.osv):
                 sellers = filter(lambda x: x.name.id in partner_ids, product.seller_ids)
             if sellers:
                 for s in sellers:
-                    seller_variant = s.product_name and "%s (%s)" % (s.product_name, variant) or False
+                    seller_variant = s.product_name and (
+                        variant and "%s (%s)" % (s.product_name, variant) or s.product_name
+                        ) or False
                     mydict = {
                               'id': product.id,
                               'name': seller_variant or name,