diff --git a/kernel/include/nano_internal.h b/kernel/include/nano_internal.h
index 2db27da7da7..4f99e86ff8b 100644
--- a/kernel/include/nano_internal.h
+++ b/kernel/include/nano_internal.h
@@ -40,7 +40,7 @@ static inline void _data_copy(void)
 #endif
 FUNC_NORETURN void _Cstart(void);
 
-extern void _thread_entry(void (*)(void *, void *, void *),
+extern FUNC_NORETURN void _thread_entry(void (*)(void *, void *, void *),
 			  void *, void *, void *);
 
 extern void _new_thread(struct k_thread *thread, char *pStack, size_t stackSize,