diff --git a/ChangeLog b/ChangeLog
index 453a09da91..aa15cc368a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jul  2 08:04:39 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* time.c (num_exact): rb_check_to_integer() can deal with both of
+	  Fixnum and Bignum together.
+
 Thu Jul  2 07:53:44 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (parser_yylex): fixed wrong variable.
diff --git a/time.c b/time.c
index 95c64a8b8d..99aae6ae13 100644
--- a/time.c
+++ b/time.c
@@ -160,14 +160,11 @@ num_exact(VALUE v)
       case T_NIL:
         goto typeerror;
 
-      default:
-      {
+      default: {
         VALUE tmp;
         if (!NIL_P(tmp = rb_check_convert_type(v, T_RATIONAL, "Rational", "to_r")))
             v = tmp;
-        else if (!NIL_P(tmp = rb_check_convert_type(v, T_FIXNUM, "Integer", "to_int")))
-            v = tmp;
-        else if (!NIL_P(tmp = rb_check_convert_type(v, T_BIGNUM, "Integer", "to_int")))
+        else if (!NIL_P(tmp = rb_check_to_integer(v, "to_int")))
             v = tmp;
         else {
           typeerror: