diff --git a/is-1.7.go b/is-1.7.go
index c75e473..f2bce81 100644
--- a/is-1.7.go
+++ b/is-1.7.go
@@ -1,3 +1,4 @@
+//go:build go1.7
 // +build go1.7
 
 package is
diff --git a/is-1.7_test.go b/is-1.7_test.go
index f4249c7..7e6604e 100644
--- a/is-1.7_test.go
+++ b/is-1.7_test.go
@@ -1,3 +1,4 @@
+//go:build go1.7
 // +build go1.7
 
 package is
diff --git a/is-before-1.7.go b/is-before-1.7.go
index c62f872..df6e328 100644
--- a/is-before-1.7.go
+++ b/is-before-1.7.go
@@ -1,3 +1,4 @@
+//go:build !go1.7
 // +build !go1.7
 
 package is
diff --git a/is_helper_test.go b/is_helper_test.go
index 6bcbf77..6926136 100644
--- a/is_helper_test.go
+++ b/is_helper_test.go
@@ -1,3 +1,4 @@
+//go:build go1.7
 // +build go1.7
 
 package is