diff --git a/syntax/todo.vim b/syntax/todo.vim
index 551b780..fe61f36 100644
--- a/syntax/todo.vim
+++ b/syntax/todo.vim
@@ -9,7 +9,7 @@ if exists("b:current_syntax")
     finish
 endif
 
-syntax  match  TodoDone       '^[xX]\s.\+$'               contains=TodoKey,TodoDate,TodoProject,TodoContext,OverDueDate
+syntax  match  TodoDone       '^[xX]\s.\+$'               contains=TodoKey,TodoDate,TodoProject,TodoContext
 syntax  match  TodoPriorityA  '^([aA])\s.\+$'             contains=TodoKey,TodoDate,TodoProject,TodoContext,OverDueDate
 syntax  match  TodoPriorityB  '^([bB])\s.\+$'             contains=TodoKey,TodoDate,TodoProject,TodoContext,OverDueDate
 syntax  match  TodoPriorityC  '^([cC])\s.\+$'             contains=TodoKey,TodoDate,TodoProject,TodoContext,OverDueDate