diff --git a/classes/dataholders/listholder.lua b/classes/dataholders/listholder.lua
index 409c1d4..de1b425 100644
--- a/classes/dataholders/listholder.lua
+++ b/classes/dataholders/listholder.lua
@@ -32,7 +32,7 @@ function ListHolder:replace(datas)
     end
 end
 
-function ListHolder:reduce(list, level)
+function ListHolder:reduce(level)
     return self.list
 end
 
diff --git a/classes/dataholders/simpleholder.lua b/classes/dataholders/simpleholder.lua
index f6a0418..af7371a 100644
--- a/classes/dataholders/simpleholder.lua
+++ b/classes/dataholders/simpleholder.lua
@@ -11,7 +11,7 @@ function SimpleHolder:applyCommand(command, args)
     self.value = args
 end
 
-function SimpleHolder:reduce(list, level)
+function SimpleHolder:reduce(level)
     return self.value
 end