diff --git a/src/math/big/arith_s390x_test.go b/src/math/big/arith_s390x_test.go
index 31a777e5f8..eaf8f232e6 100644
--- a/src/math/big/arith_s390x_test.go
+++ b/src/math/big/arith_s390x_test.go
@@ -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 s390x !math_big_pure_go
+// +build s390x,!math_big_pure_go
 
 package big