diff --git a/kernel/kthread.c b/kernel/kthread.c
index 0ac8878..25241d6 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -180,6 +180,7 @@
 	wait_task_inactive(k);
 	set_task_cpu(k, cpu);
 	k->cpus_allowed = cpumask_of_cpu(cpu);
+	k->rt.nr_cpus_allowed = 1;
 }
 EXPORT_SYMBOL(kthread_bind);