diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index c290d21b6c24d44578eeb4526d8f2bfcf9cc37a2..5ce974421a83179c0c362e00ef1b3fb097b31255 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -222,6 +222,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 	 */
 	do {
 		clear_thread_flag(TIF_SIGPENDING);
+		clear_thread_flag(TIF_NOTIFY_SIGNAL);
 		rc = kernel_wait4(-1, NULL, __WALL, NULL);
 	} while (rc != -ECHILD);