diff --git a/sched/pthread/pthread_condwait.c b/sched/pthread/pthread_condwait.c
index c94b8edaa57..412814d3398 100644
--- a/sched/pthread/pthread_condwait.c
+++ b/sched/pthread/pthread_condwait.c
@@ -94,6 +94,7 @@ int pthread_cond_wait(FAR pthread_cond_t *cond, FAR pthread_mutex_t *mutex)
       sinfo("Give up mutex / take cond\n");
 
       flags = enter_critical_section();
+      sched_lock();
       mutex->pid = INVALID_PROCESS_ID;
 #ifndef CONFIG_PTHREAD_MUTEX_UNSAFE
       mflags     = mutex->flags;
@@ -116,6 +117,7 @@ int pthread_cond_wait(FAR pthread_cond_t *cond, FAR pthread_mutex_t *mutex)
           ret = status;
         }
 
+      sched_unlock();
       leave_critical_section(flags);
 
       /* Reacquire the mutex.