diff --git a/semaphore/semaphore_bench_test.go b/semaphore/semaphore_bench_test.go
index f96d349..3b60ca8 100644
--- a/semaphore/semaphore_bench_test.go
+++ b/semaphore/semaphore_bench_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 semaphore_test
diff --git a/syncmap/go19.go b/syncmap/go19.go
index 41a5909..fa04dba 100644
--- a/syncmap/go19.go
+++ b/syncmap/go19.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 go1.9
 // +build go1.9
 
 package syncmap
diff --git a/syncmap/pre_go19.go b/syncmap/pre_go19.go
index 01a7be7..5bba413 100644
--- a/syncmap/pre_go19.go
+++ b/syncmap/pre_go19.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 !go1.9
 // +build !go1.9
 
 package syncmap