diff --git a/lib/libthr/thread/thr_list.c b/lib/libthr/thread/thr_list.c
index 6fb228b209e7..06d14e8a5c87 100644
--- a/lib/libthr/thread/thr_list.c
+++ b/lib/libthr/thread/thr_list.c
@@ -65,7 +65,7 @@ static int			inited = 0;
 LIST_HEAD(thread_hash_head, pthread);
 #define HASH_QUEUES	128
 static struct thread_hash_head	thr_hashtable[HASH_QUEUES];
-#define	THREAD_HASH(thrd)	(((unsigned long)thrd >> 12) % HASH_QUEUES)
+#define	THREAD_HASH(thrd)	(((unsigned long)thrd >> 8) % HASH_QUEUES)
 
 static void thr_destroy(struct pthread *curthread, struct pthread *thread);