diff --git a/ChangeLog b/ChangeLog
index 9480d041a4..6544e6bd8e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Jun 10 16:00:27 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* thread.c (recursive_list_access): a object id may be a Bignum.  so,
+	  the list must be a objhash, instead of a identhash.
+	  this fixes many test errors on mswin64 CI.
+
 Fri Jun 10 15:56:24 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (rb_str_modify_expand): check integer overflow.
diff --git a/thread.c b/thread.c
index f9869d5d1e..0b89918eea 100644
--- a/thread.c
+++ b/thread.c
@@ -4714,7 +4714,7 @@ recursive_list_access(VALUE sym)
 	list = rb_hash_aref(hash, sym);
     }
     if (NIL_P(list) || !RB_TYPE_P(list, T_HASH)) {
-	list = rb_ident_hash_new();
+	list = rb_hash_new();
 	rb_hash_aset(hash, sym, list);
     }
     return list;
diff --git a/version.h b/version.h
index 3d3a71cae9..ab21fce89e 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.2.6"
 #define RUBY_RELEASE_DATE "2016-06-10"
-#define RUBY_PATCHLEVEL 328
+#define RUBY_PATCHLEVEL 329
 
 #define RUBY_RELEASE_YEAR 2016
 #define RUBY_RELEASE_MONTH 6