diff --git a/ChangeLog b/ChangeLog
index c9c32615ff..8ee94ae26d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Mar 18 02:29:42 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* compile.c (iseq_build_body): add mark to jump table hash of case.
+
 Thu Mar 18 00:58:27 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* util.c (ruby_strtod): Add support for Hexadecimal
diff --git a/compile.c b/compile.c
index a89bccbc2f..8b73cbd92f 100644
--- a/compile.c
+++ b/compile.c
@@ -5290,6 +5290,7 @@ iseq_build_body(rb_iseq_t *iseq, LINK_ANCHOR *anchor,
 				rb_ary_store(op, i+1, (VALUE)label | 1);
 			    }
 			    argv[j] = op;
+			    iseq_add_mark_object_compile_time(iseq, op);
 			}
 			break;
 		      default: