diff --git a/kernel/include/ksched.h b/kernel/include/ksched.h
index 253d588aff..eb968fdc1d 100644
--- a/kernel/include/ksched.h
+++ b/kernel/include/ksched.h
@@ -39,7 +39,6 @@ BUILD_ASSERT(K_LOWEST_APPLICATION_THREAD_PRIO
 
 void z_sched_init(void);
 void z_move_thread_to_end_of_prio_q(struct k_thread *thread);
-int z_is_thread_time_slicing(struct k_thread *thread);
 void z_unpend_thread_no_timeout(struct k_thread *thread);
 struct k_thread *z_unpend1_no_timeout(_wait_q_t *wait_q);
 int z_pend_curr(struct k_spinlock *lock, k_spinlock_key_t key,