diff --git a/ChangeLog b/ChangeLog
index 95b27b8622..0cbe620f2b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Jun  2 01:27:27 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* numeric.c (int_round): small optimization to handle bignums.
+
 Fri Jun  1 13:02:35 2007  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* insnhelper.h (INC_SP): shouldn't cast ``x'' to unsigned type because
diff --git a/numeric.c b/numeric.c
index 8cf7a1e48a..6153b94549 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2308,6 +2308,22 @@ int_pow(long x, unsigned long y)
     return LONG2NUM(z);
 }
 
+static VALUE
+int_round(int argc, VALUE* argv, VALUE num)
+{
+    VALUE nd;
+    int ndigits;
+
+    if (argc == 0) return num;
+    rb_scan_args(argc, argv, "1", &nd);
+    ndigits = NUM2INT(nd);
+    if (ndigits > 0) {
+	return rb_Float(num);
+    }
+    ndigits = -ndigits;
+    return rb_funcall(num, '-', 1, rb_funcall(num, '%', 1, int_pow(10, ndigits)));
+}
+
 /*
  *  call-seq:
  *    fix ** other         => Numeric
@@ -3013,8 +3029,8 @@ Init_Numeric(void)
     rb_define_method(rb_cInteger, "to_int", int_to_i, 0);
     rb_define_method(rb_cInteger, "floor", int_to_i, 0);
     rb_define_method(rb_cInteger, "ceil", int_to_i, 0);
-    rb_define_method(rb_cInteger, "round", int_to_i, 0);
     rb_define_method(rb_cInteger, "truncate", int_to_i, 0);
+    rb_define_method(rb_cInteger, "round", int_round, -1);
 
     rb_cFixnum = rb_define_class("Fixnum", rb_cInteger);
     rb_include_module(rb_cFixnum, rb_mPrecision);
diff --git a/version.h b/version.h
index dc64e990b4..7c163e27e2 100644
--- a/version.h
+++ b/version.h
@@ -1,7 +1,7 @@
 #define RUBY_VERSION "1.9.0"
-#define RUBY_RELEASE_DATE "2007-06-01"
+#define RUBY_RELEASE_DATE "2007-06-02"
 #define RUBY_VERSION_CODE 190
-#define RUBY_RELEASE_CODE 20070601
+#define RUBY_RELEASE_CODE 20070602
 #define RUBY_PATCHLEVEL 0
 
 #define RUBY_VERSION_MAJOR 1
@@ -9,7 +9,7 @@
 #define RUBY_VERSION_TEENY 0
 #define RUBY_RELEASE_YEAR 2007
 #define RUBY_RELEASE_MONTH 6
-#define RUBY_RELEASE_DAY 1
+#define RUBY_RELEASE_DAY 2
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];