diff --git a/arch/arm64/core/thread.c b/arch/arm64/core/thread.c
index e8902d505e7..a0e604ef979 100644
--- a/arch/arm64/core/thread.c
+++ b/arch/arm64/core/thread.c
@@ -69,6 +69,12 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 	extern void z_arm64_exit_exc(void);
 	z_arch_esf_t *pInitCtx;
 
+	/*
+	 * Clean the thread->arch to avoid unexpected behavior because the
+	 * thread->arch might be dirty
+	 */
+	memset(&thread->arch, 0, sizeof(thread->arch));
+
 	/*
 	 * The ESF is now hosted at the top of the stack. For user threads this
 	 * is also fine because at this stage they are still running in EL1.
@@ -100,9 +106,6 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 		pInitCtx->elr = (uint64_t)z_thread_entry;
 	}
 
-#if defined(CONFIG_ARM_MPU)
-	atomic_clear(&thread->arch.flushing);
-#endif
 #else
 	pInitCtx->elr = (uint64_t)z_thread_entry;
 #endif