diff --git a/catalyst-uploader.go b/catalyst-uploader.go
index 02f823d..629771f 100644
--- a/catalyst-uploader.go
+++ b/catalyst-uploader.go
@@ -41,6 +41,7 @@ func run() int {
 	}
 
 	// replace stdout to prevent any lib from writing debug output there
+	stdout := os.Stdout
 	os.Stdout, _ = os.Open(os.DevNull)
 
 	uri := flag.Arg(0)
@@ -57,12 +58,11 @@ func run() int {
 
 	// success, write uploaded file details to stdout
 	if glog.V(5) {
-		b, err := json.Marshal(map[string]string{"uri": uri})
+		err = json.NewEncoder(stdout).Encode(map[string]string{"uri": uri})
 		if err != nil {
 			glog.Fatal(err)
 			return 1
 		}
-		glog.Info(string(b))
 	}
 
 	return 0
diff --git a/catalyst-uploader_test.go b/catalyst-uploader_test.go
index 7104bbd..52b7367 100644
--- a/catalyst-uploader_test.go
+++ b/catalyst-uploader_test.go
@@ -88,7 +88,7 @@ func TestFsHandlerE2E(t *testing.T) {
 	defer os.Remove(outFileName)
 
 	// run
-	uploader := exec.Command("go", "run", "catalyst-uploader.go", outFileName)
+	uploader := exec.Command("go", "run", "catalyst-uploader.go", "-v", "5", outFileName)
 	uploader.Stdin = stdinReader
 	stdoutRes, err := uploader.Output()
 	require.NoError(t, err)