diff --git a/swarm/storage/mock/test/test.go b/swarm/storage/mock/test/test.go
index 402634aa54..19af0a27bb 100644
--- a/swarm/storage/mock/test/test.go
+++ b/swarm/storage/mock/test/test.go
@@ -1,3 +1,5 @@
+// +build 1.8
+//
 // Copyright 2018 The go-ethereum Authors
 // This file is part of the go-ethereum library.
 //