diff --git a/ChangeLog b/ChangeLog
index 1fa3f9671a..97ae9e9b08 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Oct 27 07:53:25 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* gc.c (garbage_collect_with_gvl): do not garbage_collect when
+	  dont_gc flag turned on.  [ruby-core:26327]
+
 Tue Oct 27 07:38:39 2009  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/tcltklib.c,stubs.c: remove errors or warnings when compiled
diff --git a/gc.c b/gc.c
index ddfe39bf3b..2568d42b14 100644
--- a/gc.c
+++ b/gc.c
@@ -618,6 +618,7 @@ gc_with_gvl(void *ptr)
 static int
 garbage_collect_with_gvl(rb_objspace_t *objspace)
 {
+    if (dont_gc) return TRUE;
     if (ruby_thread_has_gvl_p()) {
 	return garbage_collect(objspace);
     }