diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index fc21c5d5fd5d..1daadbefcee3 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -214,6 +214,7 @@ 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);