diff --git a/kernel/sched.c b/kernel/sched.c
index 94fa333..f2be618 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8018,6 +8018,7 @@
 	free_cpumask_var(non_isolated_cpus);
 
 	alloc_cpumask_var(&fallback_doms, GFP_KERNEL);
+	init_sched_rt_class();
 }
 #else
 void __init sched_init_smp(void)