diff --git a/ChangeLog b/ChangeLog
index 70c6371..8502595 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2016-05-12  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chopstx_mutex_init): Initialize OWNER, too.
+
 2016-04-24  Niibe Yutaka  <gniibe@fsij.org>
 
 	* chopstx.c (chx_snooze): Wait forever when it's POLL and usec==0.
diff --git a/chopstx.c b/chopstx.c
index 3cb4c02..5910681 100644
--- a/chopstx.c
+++ b/chopstx.c
@@ -1182,6 +1182,7 @@ chopstx_mutex_init (chopstx_mutex_t *mutex)
   chx_spin_init (&mutex->lock);
   mutex->q.next = mutex->q.prev = (struct chx_pq *)&mutex->q;
   mutex->list = NULL;
+  mutex->owner = NULL;
 }