diff --git a/ChangeLog b/ChangeLog
index e8a9c84ed0..785f92f5a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Apr 21 18:36:28 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
+
+	* bignum.c (rb_cstr_to_inum): unnecessarily long buffer was used
+	  for radix 9.  [ruby-dev:20057]
+
 Mon Apr 21 17:44:34 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* parse.y (block_append, value_expr0, assign_in_cond,
diff --git a/bignum.c b/bignum.c
index 5917f04bc9..01c882476e 100644
--- a/bignum.c
+++ b/bignum.c
@@ -389,7 +389,7 @@ rb_cstr_to_inum(str, base, badcheck)
 	if (str[0] == '0' && (str[1] == 'd'||str[1] == 'D')) {
 	    str += 2;
 	}
-      case 11: case 12: case 13: case 14: case 15:
+      case 9: case 11: case 12: case 13: case 14: case 15:
 	len = 4;
 	break;
       case 16: