diff --git a/ChangeLog b/ChangeLog
index 71e23f4dc1..3756b47df7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Mar 20 16:12:53 2003  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* numeric.c (flo_to_s): change format specifier to "%.15g" to
+	  avoid unnecessary 9s (e.g. 99.59999999999999). (ruby-bugs-ja PR#406)
+
 Thu Mar 20 16:03:18 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* parse.y (stmt, primary): get rid of SEGV at empty or invalid
diff --git a/numeric.c b/numeric.c
index 5157b3b64f..e3344497c5 100644
--- a/numeric.c
+++ b/numeric.c
@@ -273,7 +273,7 @@ flo_to_s(flt)
     VALUE flt;
 {
     char buf[24];
-    char *fmt = "%.16g";
+    char *fmt = "%.15g";
     double value = RFLOAT(flt)->value;
     double avalue, d1, d2;