diff --git a/ChangeLog b/ChangeLog
index ba7acb1543..a87737fe65 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jul  8 10:39:52 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* thread_pthread.c (gvl_destroy): fix cond_t leak.
+
 Fri Jul  8 09:17:59 2011  Eric Hodel  <drbrain@segment7.net>
 
 	* gc.c:  Improve documentation
diff --git a/thread_pthread.c b/thread_pthread.c
index 9748526140..b353a9e64c 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -148,6 +148,9 @@ gvl_init(rb_vm_t *vm)
 static void
 gvl_destroy(rb_vm_t *vm)
 {
+    native_cond_destroy(&vm->gvl.switch_wait_cond);
+    native_cond_destroy(&vm->gvl.switch_cond);
+    native_cond_destroy(&vm->gvl.cond);
     native_mutex_destroy(&vm->gvl.lock);
 }