diff --git a/ChangeLog b/ChangeLog
index a2c420130d..e370a48541 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Jun 19 23:29:29 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (rb_gc_force_recycle): clear oldgen bitmap, too.
+
 Wed Jun 19 21:02:13 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (rb_uint2big): Consider environments BDIGIT is bigger than
diff --git a/gc.c b/gc.c
index f296c1fc4c..57e60b3ccd 100644
--- a/gc.c
+++ b/gc.c
@@ -3809,6 +3809,7 @@ rb_gc_force_recycle(VALUE p)
 
 #if USE_RGENGC
     CLEAR_IN_BITMAP(GET_HEAP_REMEMBERSET_BITS(p), p);
+    CLEAR_IN_BITMAP(GET_HEAP_OLDGEN_BITS(p), p);
 #endif
 
     objspace->total_freed_object_num++;