diff --git a/sched/signal/sig_deliver.c b/sched/signal/sig_deliver.c
index da6cac89d4..d6970ef8b1 100644
--- a/sched/signal/sig_deliver.c
+++ b/sched/signal/sig_deliver.c
@@ -117,6 +117,7 @@ void nxsig_deliver(FAR struct tcb_s *stcb)
 
       savesigprocmask   = stcb->sigprocmask;
       sigorset(&newsigprocmask, &savesigprocmask, &sigq->mask);
+      nxsig_addset(&newsigprocmask, sigq->info.si_signo);
       stcb->sigprocmask = newsigprocmask;
 
 #ifndef CONFIG_BUILD_FLAT