diff --git a/kernel/include/kswap.h b/kernel/include/kswap.h
index 03c4a991bb0..0d790ed3a17 100644
--- a/kernel/include/kswap.h
+++ b/kernel/include/kswap.h
@@ -193,7 +193,6 @@ static inline void z_swap_unlocked(void)
 
 #else /* !CONFIG_USE_SWITCH */
 
-extern int arch_swap(unsigned int key);
 
 static inline void z_sched_switch_spin(struct k_thread *thread)
 {