diff --git a/sched/semaphore/sem_post.c b/sched/semaphore/sem_post.c
index 875dfa8f8f..ae04819492 100644
--- a/sched/semaphore/sem_post.c
+++ b/sched/semaphore/sem_post.c
@@ -198,7 +198,7 @@ int nxsem_post_slow(FAR sem_t *sem)
           if (mutex)
             {
               uint32_t blocking_bit = dq_empty(SEM_WAITLIST(sem)) ?
-                NXSEM_MBLOCKING_BIT : 0;
+                0 : NXSEM_MBLOCKING_BIT;
               atomic_set(NXSEM_MHOLDER(sem),
                          ((uint32_t)stcb->pid) | blocking_bit);
             }