diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 7d367c140a36..48b4834c7027 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -297,7 +297,6 @@ static void scx_set_task_sched(struct task_struct *p, struct scx_sched *sch)
 #else	/* CONFIG_EXT_SUB_SCHED */
 static struct scx_sched *scx_parent(struct scx_sched *sch) { return NULL; }
 static struct scx_sched *scx_next_descendant_pre(struct scx_sched *pos, struct scx_sched *root) { return pos ? NULL : root; }
-static struct scx_sched *scx_find_sub_sched(u64 cgroup_id) { return NULL; }
 static void scx_set_task_sched(struct task_struct *p, struct scx_sched *sch) {}
 #endif	/* CONFIG_EXT_SUB_SCHED */