diff --git a/ChangeLog b/ChangeLog
index 45ae085de9..2da88a405a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun May 29 23:22:46 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* numeric.c (flo_round): use absolute value as divisor.
+
 Sun May 29 23:17:29 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* re.c (rb_reg_match): fix rdoc of Regexp#=~.
diff --git a/numeric.c b/numeric.c
index 09860dc6f2..b868c51bea 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1512,7 +1512,7 @@ flo_round(int argc, VALUE *argv, VALUE num)
 		VALUE f10 = int_pow(10, -ndigits);
 		VALUE n10 = f10;
 		if (number < 0) {
-		    f10 = FIXNUM_P(f10) ? fix_uminus(f10) : rb_big_uminus(f10);
+		    n10 = FIXNUM_P(n10) ? fix_uminus(n10) : rb_big_uminus(n10);
 		}
 		num = rb_big_idiv(rb_dbl2big(absnum), n10);
 		return FIXNUM_P(num) ? fix_mul(num, f10) : rb_big_mul(num, f10);