diff --git a/lib/libthr/thread/thr_mutex.c b/lib/libthr/thread/thr_mutex.c
index 0e3cebe49144..7d5922ac1582 100644
--- a/lib/libthr/thread/thr_mutex.c
+++ b/lib/libthr/thread/thr_mutex.c
@@ -128,7 +128,6 @@ mutex_init(pthread_mutex_t *mutex,
 		pmutex->m_prio = attr->m_ceiling;
 	else
 		pmutex->m_prio = -1;
-	pmutex->m_saved_prio = 0;
 	MUTEX_INIT_LINK(pmutex);
 	*mutex = pmutex;
 	return (0);
@@ -191,7 +190,6 @@ _mutex_reinit(pthread_mutex_t *mutex)
 	(*mutex)->m_count = 0;
 	(*mutex)->m_refcount = 0;
 	(*mutex)->m_prio = 0;
-	(*mutex)->m_saved_prio = 0;
 	return (0);
 }
 
diff --git a/lib/libthr/thread/thr_private.h b/lib/libthr/thread/thr_private.h
index bb6c999b71e1..4ec4208b5051 100644
--- a/lib/libthr/thread/thr_private.h
+++ b/lib/libthr/thread/thr_private.h
@@ -121,18 +121,10 @@ struct pthread_mutex {
 	int				m_refcount;
 
 	/*
-	 * Used for priority inheritence and protection.
-	 *
-	 *   m_prio       - For priority inheritence, the highest active
-	 *                  priority (threads locking the mutex inherit
-	 *                  this priority).  For priority protection, the
-	 *                  ceiling priority of this mutex.
-	 *   m_saved_prio - mutex owners inherited priority before
-	 *                  taking the mutex, restored when the owner
-	 *                  unlocks the mutex.
+	 * Used for priority protection, the ceiling priority of
+	 * this mutex.
 	 */
 	int				m_prio;
-	int				m_saved_prio;
 
 	/*
 	 * Link for list of all mutexes a thread currently owns.