diff --git a/ChangeLog b/ChangeLog
index e5d0d43e8c..870bd9b36b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Dec 31 22:57:00 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* eval.c (rb_thread_save_context): should not recycle scope object used
+	  in a thread.  fixed: [ruby-dev:28177]
+
 Fri Dec 30 18:22:42 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* gc.c (garbage_collect): mark objects refered from aborting threads.
diff --git a/eval.c b/eval.c
index 49dfe28cd7..a354b3ab16 100644
--- a/eval.c
+++ b/eval.c
@@ -10117,6 +10117,7 @@ rb_thread_save_context(th)
 
     th->frame = ruby_frame;
     th->scope = ruby_scope;
+    ruby_scope->flags |= SCOPE_DONT_RECYCLE;
     th->klass = ruby_class;
     th->wrapper = ruby_wrapper;
     th->cref = ruby_cref;