diff --git a/sm4/sm4ni_xts.go b/sm4/sm4ni_xts.go
index ad9e548..434f8c9 100644
--- a/sm4/sm4ni_xts.go
+++ b/sm4/sm4ni_xts.go
@@ -1,5 +1,5 @@
-//go:build (amd64 && !purego) || (arm64 && !purego)
-// +build amd64,!purego arm64,!purego
+//go:build arm64 && !purego
+// +build arm64,!purego
 
 package sm4