diff --git a/ChangeLog b/ChangeLog
index 1c5030162f..5b7e030a16 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Apr 15 16:05:11 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
+
+	* numeric.c (rb_fix2str): buffer was insufficient.
+	  (ruby-bugs-ja:PR#431)
+
 Mon Apr 14 19:45:56 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* file.c (file_expand_path): root must follow buf when
diff --git a/numeric.c b/numeric.c
index 13466d7899..e77c09faaf 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1179,7 +1179,7 @@ rb_fix2str(x, base)
     int base;
 {
     extern const char ruby_digitmap[];
-    char buf[SIZEOF_LONG*CHAR_BIT/2 + 2], *b = buf + sizeof buf;
+    char buf[SIZEOF_LONG*CHAR_BIT + 2], *b = buf + sizeof buf;
     long val = FIX2LONG(x);
     int neg = 0;