diff --git a/2017/state-of-go/stdlib/sort/sort_test.go b/2017/state-of-go/stdlib/sort/sort_test.go
index 6e58d64..1cc20fb 100644
--- a/2017/state-of-go/stdlib/sort/sort_test.go
+++ b/2017/state-of-go/stdlib/sort/sort_test.go
@@ -1,3 +1,5 @@
+// +build go1.8
+
 package main
 
 import (