diff --git a/NumLib/Assembler/SerialExecutor.h b/NumLib/Assembler/SerialExecutor.h
index 1c31fa78b7a3b9e7242af2a1c7a6370cb84e24b9..18dc2f759e5eef828e870b8f7c9b2490c45b960c 100644
--- a/NumLib/Assembler/SerialExecutor.h
+++ b/NumLib/Assembler/SerialExecutor.h
@@ -109,7 +109,8 @@ struct SerialExecutor
 
         for (std::size_t i = 0; i < active_container_ids.size(); i++)
         {
-            (object.*method)(i, *container[active_container_ids[i]],
+            (object.*method)(active_container_ids[i],
+                             *container[active_container_ids[i]],
                              std::forward<Args>(args)...);
         }
     }