diff --git a/go.mod b/go.mod
index 46ac917..176cc09 100644
--- a/go.mod
+++ b/go.mod
@@ -1 +1,3 @@
 module golang.org/x/time
+
+go 1.18
diff --git a/rate/rate_test.go b/rate/rate_test.go
index a063e35..48ebaef 100644
--- a/rate/rate_test.go
+++ b/rate/rate_test.go
@@ -2,9 +2,6 @@
 // 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
 
 import (