diff --git a/marshal.c b/marshal.c
index 4372960a71..8cd4dc6079 100644
--- a/marshal.c
+++ b/marshal.c
@@ -1189,7 +1189,7 @@ io_needed(void)
  * * anonymous Class/Module.
  * * objects which are related to system (ex: Dir, File::Stat, IO, File, Socket
  *   and so on)
- * * an instance of MatchData, Data, Method, UnboundMethod, Proc, Thread,
+ * * an instance of MatchData, Method, UnboundMethod, Proc, Thread,
  *   ThreadGroup, Continuation
  * * objects which define singleton methods
  */