diff --git a/nginx_vts_exporter.go b/nginx_vts_exporter.go
index e60f515..a556354 100644
--- a/nginx_vts_exporter.go
+++ b/nginx_vts_exporter.go
@@ -10,7 +10,6 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"strconv"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"