diff --git a/include/signal.h b/include/signal.h
index 84ee27e8232..3215f04b1e6 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -390,7 +390,7 @@ struct sigaction
   } sa_u;
   sigset_t          sa_mask;
   int               sa_flags;
-  FAR void         *sa_user;
+  FAR void         *sa_user; /* Passed to siginfo.si_user (non-standard) */
 };
 
 /* Definitions that adjust the non-standard naming */
diff --git a/sched/signal/sig_dispatch.c b/sched/signal/sig_dispatch.c
index 0d3c7b646d5..d910fb09044 100644
--- a/sched/signal/sig_dispatch.c
+++ b/sched/signal/sig_dispatch.c
@@ -101,6 +101,7 @@ static int nxsig_queue_action(FAR struct tcb_s *stcb, siginfo_t *info)
             }
 
           memcpy(&sigq->info, info, sizeof(siginfo_t));
+          sigq->info.si_user = sigact->act.sa_user;
 
           /* Put it at the end of the pending signals list */
 
diff --git a/sched/signal/sig_queue.c b/sched/signal/sig_queue.c
index 6b9651806c0..a611f63cc2b 100644
--- a/sched/signal/sig_queue.c
+++ b/sched/signal/sig_queue.c
@@ -101,6 +101,7 @@ int nxsig_queue(int pid, int signo, union sigval value)
   info.si_pid             = rtcb->pid;
   info.si_status          = OK;
 #endif
+  info.si_user            = NULL; /* Will be set in sig_dispatch.c */
 
   /* Send the signal */