testutil/testutil.go | 1 +

diff --git a/testutil/testutil.go b/testutil/testutil.go
index f3616b6a7c4c73c10f8538432a2eee7bbc102c16..e4b606080853d91be9e4d8e4e86112a57f5f93e0 100644
--- a/testutil/testutil.go
+++ b/testutil/testutil.go
@@ -19,6 +19,7 @@ const GreetingFileContents = "hello, world\n"
 
 func CreateDummyTorrentData(dirName string) string {
 	f, _ := os.Create(filepath.Join(dirName, "greeting"))
+	defer f.Close()
 	f.WriteString("hello, world\n")
 	return f.Name()
 }