diff --git a/ChangeLog b/ChangeLog
index 922ee1ea84..6a4b3814ed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed May 20 17:58:52 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* enum.c (zip_ary): should use long.
+
 Wed May 20 06:25:29 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* encoding.c (rb_enc_fast_mbclen): faster mbclen for strings known
diff --git a/enum.c b/enum.c
index ebeb069221..938e3c3e5e 100644
--- a/enum.c
+++ b/enum.c
@@ -1456,7 +1456,7 @@ zip_ary(VALUE val, NODE *memo, int argc, VALUE *argv)
 {
     volatile VALUE result = memo->u1.value;
     volatile VALUE args = memo->u2.value;
-    int n = memo->u3.cnt++;
+    long n = memo->u3.cnt++;
     volatile VALUE tmp;
     int i;