diff --git a/ChangeLog b/ChangeLog
index 7705b7062f..c39fdb2198 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue May  4 22:59:48 2010  wanabe  <s.wanabe@gmail.com>
+
+	* compile.c (iseq_build_body): update iseq->ic_size.
+	  a patch from Tomoyuki Chikanaga. see #3236.
+
 Tue May  4 18:51:22 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* error.c (name_err_mesg_to_str): preserve encoding of inspection.
diff --git a/compile.c b/compile.c
index f1a04feaba..f3e43fc3b7 100644
--- a/compile.c
+++ b/compile.c
@@ -5269,6 +5269,8 @@ iseq_build_body(rb_iseq_t *iseq, LINK_ANCHOR *anchor,
 			break;
 		      case TS_IC:
 			argv[j] = op;
+			if (NUM2INT(op) >= iseq->ic_size)
+			    iseq->ic_size = NUM2INT(op) + 1;
 			break;
 		      case TS_ID:
 			argv[j] = rb_convert_type(op, T_SYMBOL,