diff --git a/ChangeLog b/ChangeLog
index d487c0b700..4df8fa1289 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Aug 17 01:24:12 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* iseq.c (ruby_iseq_disasm): fix to show arg_simple value.
+
 Fri Aug 17 01:21:29 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* insns.def (throw): insert a RUBY_VM_CHECK_INTS(). [ruby-dev:31361]
diff --git a/iseq.c b/iseq.c
index 091faef58f..e9e65c76fa 100644
--- a/iseq.c
+++ b/iseq.c
@@ -809,11 +809,11 @@ ruby_iseq_disasm(VALUE self)
     if (tbl) {
 	snprintf(buff, sizeof(buff),
 		 "local table (size: %d, argc: %d "
-		 "[opts: %d, rest: %d, post: %d, block: %d] %s)\n",
+		 "[opts: %d, rest: %d, post: %d, block: %d] s%d)\n",
 		 iseqdat->local_size, iseqdat->argc,
 		 iseqdat->arg_opts, iseqdat->arg_rest,
 		 iseqdat->arg_post_len, iseqdat->arg_block,
-		 iseqdat->arg_simple ? "s" : "c");
+		 iseqdat->arg_simple);
 	rb_str_cat2(str, buff);
 
 	for (i = 0; i < iseqdat->local_table_size; i++) {