diff --git a/sched/signal/sig_dispatch.c b/sched/signal/sig_dispatch.c
index 2bffa2f29a..13459a20fa 100644
--- a/sched/signal/sig_dispatch.c
+++ b/sched/signal/sig_dispatch.c
@@ -193,13 +193,20 @@ static FAR sigpendq_t *nxsig_alloc_pendingsignal(void)
  ****************************************************************************/
 
 static FAR sigpendq_t *
-  nxsig_find_pendingsignal(FAR struct task_group_s *group, int signo)
+nxsig_find_pendingsignal(FAR struct task_group_s *group, int signo)
 {
   FAR sigpendq_t *sigpend = NULL;
   irqstate_t flags;
 
   DEBUGASSERT(group != NULL);
 
+  /* Determining whether a signal is reliable or unreliable */
+
+  if (SIGRTMIN <= signo && signo <= SIGRTMAX)
+    {
+      return sigpend;
+    }
+
   /* Pending signals can be added from interrupt level. */
 
   flags = enter_critical_section();