diff --git a/kernel/include/ksched.h b/kernel/include/ksched.h
index 9983625ad79..b69175de545 100644
--- a/kernel/include/ksched.h
+++ b/kernel/include/ksched.h
@@ -47,6 +47,7 @@ void *_get_next_switch_handle(void *interrupted);
 struct k_thread *_find_first_thread_to_unpend(_wait_q_t *wait_q,
 					      struct k_thread *from);
 void idle(void *a, void *b, void *c);
+void _ready_thread(struct k_thread *thread);
 
 /* find which one is the next thread to run */
 /* must be called with interrupts locked */
@@ -216,16 +217,6 @@ static inline int _is_valid_prio(int prio, void *entry_point)
 	return 1;
 }
 
-static inline void _ready_thread(struct k_thread *thread)
-{
-	if (_is_thread_ready(thread)) {
-		_add_thread_to_ready_q(thread);
-	}
-
-	sys_trace_thread_ready(thread);
-
-}
-
 static inline void _ready_one_thread(_wait_q_t *wq)
 {
 	struct k_thread *th = _unpend_first_thread(wq);
diff --git a/kernel/sched.c b/kernel/sched.c
index 108f5102add..f97c0974d59 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -658,6 +658,21 @@ void _update_time_slice_before_swap(void)
 }
 #endif /* CONFIG_TIMESLICING */
 
+void _ready_thread(struct k_thread *thread)
+{
+	if (_is_thread_ready(thread)) {
+		_add_thread_to_ready_q(thread);
+	}
+
+#if defined(CONFIG_TICKLESS_KERNEL) && !defined(CONFIG_SMP)
+	if (_is_thread_time_slicing(_get_next_ready_thread())) {
+		_set_time(_time_slice_duration);
+	}
+#endif
+
+	sys_trace_thread_ready(thread);
+}
+
 int _unpend_all(_wait_q_t *waitq)
 {
 	int need_sched = 0;