diff --git a/ChangeLog b/ChangeLog
index 8c8db1e186..40d4c74c0f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Thu Mar 12 05:14:50 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Mar 12 05:16:07 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* process.c (rb_f_sleep): time() needs time_t.
 
 	* random.c (fill_random_seed): enclosed conditionally used
 	  variables.
diff --git a/process.c b/process.c
index fb18d96001..0903f37f9c 100644
--- a/process.c
+++ b/process.c
@@ -3220,7 +3220,7 @@ rb_f_spawn(int argc, VALUE *argv)
 static VALUE
 rb_f_sleep(int argc, VALUE *argv)
 {
-    int beg, end;
+    time_t beg, end;
 
     beg = time(0);
     if (argc == 0) {