diff --git a/kernel/signal.c b/kernel/signal.c
index ba3da25..d803473 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -883,6 +883,8 @@
 			break;
 		default:
 			copy_siginfo(&q->info, info);
+			if (from_ancestor_ns)
+				q->info.si_pid = 0;
 			break;
 		}
 	} else if (!is_si_special(info)) {