diff --git a/test/test-app/main.go b/test/test-app/main.go
index 094c300..04c9655 100644
--- a/test/test-app/main.go
+++ b/test/test-app/main.go
@@ -10,7 +10,7 @@ const (
 )
 
 func HelloWorld(w http.ResponseWriter, r *http.Request) {
-  fmt.Println(w, "Hello, world !")
+  fmt.Fprintln(w, "Hello, world !")
 }
 
 func main() {