diff --git a/samples/hellofs/hello_fs_test.go b/samples/hellofs/hello_fs_test.go
index c336029..4fa042f 100644
--- a/samples/hellofs/hello_fs_test.go
+++ b/samples/hellofs/hello_fs_test.go
@@ -41,9 +41,10 @@ type HelloFSTest struct {
 func init() { RegisterTestSuite(&HelloFSTest{}) }
 
 func (t *HelloFSTest) SetUp(ti *TestInfo) {
-	t.FileSystem = &hellofs.HelloFS{
-		Clock: &t.Clock,
-	}
+	var err error
+
+	t.Server, err = hellofs.NewHelloFS(&t.Clock)
+	AssertEq(nil, err)
 
 	t.SampleTest.SetUp(ti)
 }