diff --git a/inventory.py b/inventory.py
index 81191a7a45..1817fd533f 100644
--- a/inventory.py
+++ b/inventory.py
@@ -149,8 +149,8 @@ class Inventory(Workflow, ModelSQL, ModelView):
             new_inventories.append(new_inventory)
         return new_inventories
 
-    @classmethod
-    def complete_lines(self, inventories):
+    @staticmethod
+    def complete_lines(inventories):
         '''
         Complete or update the inventories
         '''