diff --git a/ChangeLog b/ChangeLog
index 65e1af618b..55faebeb46 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Nov  9 09:04:48 2013  Masaya Tarui  <tarui@ruby-lang.org>
+
+	* gc.c (gc_marks_test): Bugfix. Fix a struct member name for build
+	  with RGENGC_CHECK_MODE.
+
 Sat Nov  9 08:58:23 2013  Masaya Tarui  <tarui@ruby-lang.org>
 
 	* gc.c : Add GC_PROFILE_DETAIL_MEMORY option.
diff --git a/gc.c b/gc.c
index 30d703258c..087efcd0e6 100644
--- a/gc.c
+++ b/gc.c
@@ -4267,13 +4267,13 @@ gc_marks_test(rb_objspace_t *objspace)
     rgengc_report(1, objspace, "gc_marks_test: test-full-gc\n");
 
     /* run major (full) gc with temporary mark/rememberset */
-    stored_oldgen = objspace->rgengc.oldgen_object_count;
+    stored_oldgen = objspace->rgengc.old_object_count;
     stored_shady = objspace->rgengc.remembered_shady_object_count;
     {
 	gc_marks_body(objspace, TRUE);
     }
     objspace->rgengc.during_minor_gc = TRUE;
-    objspace->rgengc.oldgen_object_count = stored_oldgen;
+    objspace->rgengc.old_object_count = stored_oldgen;
     objspace->rgengc.remembered_shady_object_count = stored_shady;
 
     /* check */