diff --git a/ChangeLog b/ChangeLog
index e888e91f87..3428103c4b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Feb  5 09:26:54 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* bignum.c (big_op): remove unused variables.
+
 Fri Feb  5 02:06:57 2010  Aaron Patterson <tenderlove@ruby-lang.org>
 
 	* lib/yaml/rubytypes.rb: Struct members are emitted without a leading
diff --git a/bignum.c b/bignum.c
index d3b1d013cc..175b66395f 100644
--- a/bignum.c
+++ b/bignum.c
@@ -1332,8 +1332,6 @@ rb_big_cmp(VALUE x, VALUE y)
 static VALUE
 big_op(VALUE x, VALUE y, int op)
 {
-    long xlen = RBIGNUM_LEN(x);
-    BDIGIT *xds, *yds;
     VALUE rel;
     int n;