diff --git a/src/app/root-view.coffee b/src/app/root-view.coffee
index 1079718a8..a356a8265 100644
--- a/src/app/root-view.coffee
+++ b/src/app/root-view.coffee
@@ -234,7 +234,7 @@ class RootView extends View
 
   getFontSize: -> @fontSize
 
-  setInvisiblesMap: (newMap) -> @invisiblesMap = newMap
+  setInvisiblesMap: (@invisiblesMap) ->
   getInvisiblesMap: -> @invisiblesMap
 
   loadUserConfiguration: ->