diff --git a/sched/semaphore/sem_post.c b/sched/semaphore/sem_post.c
index e9f69dfe1ac..a16150d00db 100644
--- a/sched/semaphore/sem_post.c
+++ b/sched/semaphore/sem_post.c
@@ -147,6 +147,10 @@ int nxsem_post(FAR sem_t *sem)
 
               nxsem_add_holder_tcb(stcb, sem);
 
+              /* Stop the watchdog timer */
+
+              wd_cancel(&stcb->waitdog);
+
               /* It is, let the task take the semaphore */
 
               stcb->waitsem = NULL;