diff --git a/go/gcexportdata/example_test.go b/go/gcexportdata/example_test.go
index 6164f93b..1d7f4727 100644
--- a/go/gcexportdata/example_test.go
+++ b/go/gcexportdata/example_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.7
+
 package gcexportdata_test
 
 import (