diff --git a/field/fe_arm64.s b/field/fe_arm64.s
index 751ab2a..3126a43 100644
--- a/field/fe_arm64.s
+++ b/field/fe_arm64.s
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build arm64,gc,!purego
+//go:build arm64 && gc && !purego
 
 #include "textflag.h"