diff --git a/product/ERP5/tests/testInventoryAPI.py b/product/ERP5/tests/testInventoryAPI.py
index 6df8a25c549d1f1638af5a10dd47f1619e2a1df5..f1a28bf3c6f820b61b60dbaecfc5cf7140bc311e 100644
--- a/product/ERP5/tests/testInventoryAPI.py
+++ b/product/ERP5/tests/testInventoryAPI.py
@@ -666,7 +666,7 @@ class TestInventoryList(InventoryAPITestCase):
     self._makeMovement(resource_value=self.other_resource, quantity=100)
     # group_by_resource is implicit ...
     inventory_list = getInventoryList(node_uid=self.node.getUid(),
-                                      group_by_node=1, group_by_resource=1)
+                                      group_by_node=1)
     self.assertEquals(2, len(inventory_list))
     self.assertEquals([r for r in inventory_list if r.resource_relative_url ==
                   self.resource.getRelativeUrl()][0].inventory, 100)