diff --git a/kernel/init.c b/kernel/init.c
index e2900e6b28a..bfbebea3d61 100644
--- a/kernel/init.c
+++ b/kernel/init.c
@@ -310,14 +310,14 @@ void __weak main(void)
 #if defined(CONFIG_MULTITHREADING)
 static void init_idle_thread(struct k_thread *thr, k_thread_stack_t *stack)
 {
-#ifdef CONFIG_SMP
-	thr->base.is_idle = 1U;
-#endif
-
 	z_setup_new_thread(thr, stack,
 			  IDLE_STACK_SIZE, idle, NULL, NULL, NULL,
 			  K_LOWEST_THREAD_PRIO, K_ESSENTIAL, IDLE_THREAD_NAME);
 	z_mark_thread_as_started(thr);
+
+#ifdef CONFIG_SMP
+	thr->base.is_idle = 1U;
+#endif
 }
 #endif /* CONFIG_MULTITHREADING */
 
diff --git a/kernel/pipes.c b/kernel/pipes.c
index 83a1c5b1461..e48fa9b1450 100644
--- a/kernel/pipes.c
+++ b/kernel/pipes.c
@@ -767,6 +767,9 @@ void k_pipe_block_put(struct k_pipe *pipe, struct k_mem_block *block,
 	async_desc->desc.copy_block = *block;
 	async_desc->desc.sem = sem;
 	async_desc->thread.prio = k_thread_priority_get(_current);
+#ifdef CONFIG_SMP
+	async_desc->thread.is_idle = 0;
+#endif
 
 	(void) z_pipe_put_internal(pipe, async_desc, block->data,
 				    bytes_to_write, &dummy_bytes_written,
diff --git a/kernel/thread.c b/kernel/thread.c
index b0a2bca138a..b6b8a70969c 100644
--- a/kernel/thread.c
+++ b/kernel/thread.c
@@ -775,6 +775,10 @@ void z_init_thread_base(struct _thread_base *thread_base, int priority,
 
 	thread_base->sched_locked = 0U;
 
+#ifdef CONFIG_SMP
+	thread_base->is_idle = 0;
+#endif
+
 	/* swap_data does not need to be initialized */
 
 	z_init_thread_timeout(thread_base);