diff --git a/ChangeLog b/ChangeLog
index d8f0c84d85..34246707c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 Fri Oct 29 10:00:30 2004  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
+	* eval.c (rb_thread_start_0): forget to free some memory chunks.
+	  [ruby-core:03611]
+
 	* eval.c (ruby_cleanup): ruby_finalize_1 may cause exception,
 	  should be wrapped by PUSH_TAG/POP_TAG().  [ruby-dev:24627]
 
diff --git a/eval.c b/eval.c
index 530662fdc2..9bf2410ddc 100644
--- a/eval.c
+++ b/eval.c
@@ -11385,13 +11385,8 @@ rb_thread_start_0(fn, arg, th)
     if (th == main_thread) ruby_stop(state);
     rb_thread_remove(th);
 
-    for (block = saved_block; block;) {
-	struct BLOCK *tmp = block;
-
-	if (tmp->frame.argc > 0)
-	    free(tmp->frame.argv);
-	block = tmp->prev;
-	free((void*)tmp);
+    if (saved_block) {
+	blk_free(saved_block);
     }
 
     if (state && status != THREAD_TO_KILL && !NIL_P(ruby_errinfo)) {