diff --git a/src/app/language-mode.coffee b/src/app/language-mode.coffee
index c0cd4c1d8..d305f5f10 100644
--- a/src/app/language-mode.coffee
+++ b/src/app/language-mode.coffee
@@ -84,7 +84,7 @@ class LanguageMode
         indent = @minIndentLevelForRowRange(start, end)
         indentString = @editSession.buildIndentString(indent)
         for row in [start..end]
-          buffer.change(new Range([row, 0], [row, indentString.length]), indentString+commentStartString)
+          buffer.change([[row, 0], [row, indentString.length]], indentString+commentStartString)
 
   # Folds all the foldable lines in the buffer.
   foldAll: ->