diff --git a/ChangeLog b/ChangeLog
index 218f016eb7..eb109cafa5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun May 24 22:39:33 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* error.c (syserr_initialize): errno is int.
+
 Sun May 24 00:52:54 2009  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
 
 	* configure.in ($ridir): new configuration. [ruby-core:23520].
diff --git a/error.c b/error.c
index 4c23894f36..07a72a9a94 100644
--- a/error.c
+++ b/error.c
@@ -949,7 +949,7 @@ syserr_initialize(int argc, VALUE *argv, VALUE self)
 	rb_scan_args(argc, argv, "01", &mesg);
 	error = rb_const_get(klass, rb_intern("Errno"));
     }
-    if (!NIL_P(error)) err = strerror(NUM2LONG(error));
+    if (!NIL_P(error)) err = strerror(NUM2INT(error));
     else err = "unknown error";
     if (!NIL_P(mesg)) {
 	VALUE str = mesg;