diff --git a/sched/pthread/pthread_mutexconsistent.c b/sched/pthread/pthread_mutexconsistent.c
index 0579cb3841d..3febab2d0b0 100644
--- a/sched/pthread/pthread_mutexconsistent.c
+++ b/sched/pthread/pthread_mutexconsistent.c
@@ -118,7 +118,8 @@ int pthread_mutex_consistent(FAR pthread_mutex_t *mutex)
             {
               /* The thread associated with the PID no longer exists */
 
-              mutex->pid = -1;
+              mutex->pid   = -1;
+              mutex->flags = 0;
 
               /* Reset the semaphore.  This has the same affect as if the
                * dead task had called pthread_mutex_unlock().