diff --git a/rate/rate_test.go b/rate/rate_test.go
index b0ed34d..866347c 100644
--- a/rate/rate_test.go
+++ b/rate/rate_test.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build go1.7
 // +build go1.7
 
 package rate