diff --git a/controllers/nginx/pkg/metric/collector/nginx.go b/controllers/nginx/pkg/metric/collector/nginx.go
index a51b7de39..9fc58952d 100644
--- a/controllers/nginx/pkg/metric/collector/nginx.go
+++ b/controllers/nginx/pkg/metric/collector/nginx.go
@@ -43,13 +43,15 @@ type (
 	}
 )
 
-func buildNS(system, namespace, class string) string {
+func buildNS(namespace, class string) string {
 	if namespace == "" {
 		namespace = "all"
 	}
+
 	if class == "" {
 		class = "all"
 	}
+
 	if strings.Compare(system, namespace) == 1 {
 		namespace = ""
 	}
@@ -65,7 +67,7 @@ func NewNginxStatus(namespace, class string, ngxHealthPort int, ngxVtsPath strin
 		ngxVtsPath:    ngxVtsPath,
 	}
 
-	ns := buildNS(system, namespace, class)
+	ns := buildNS(namespace, class)
 
 	p.data = &nginxStatusData{
 		active: prometheus.NewDesc(
diff --git a/controllers/nginx/pkg/metric/collector/vts.go b/controllers/nginx/pkg/metric/collector/vts.go
index 9ec488cb9..4d80d66c4 100644
--- a/controllers/nginx/pkg/metric/collector/vts.go
+++ b/controllers/nginx/pkg/metric/collector/vts.go
@@ -62,7 +62,7 @@ func NewNGINXVTSCollector(namespace, class string, ngxHealthPort int, ngxVtsPath
 		ngxVtsPath:    ngxVtsPath,
 	}
 
-	ns := buildNS(system, namespace, class)
+	ns := buildNS(namespace, class)
 
 	p.data = &vtsData{
 		bytes: prometheus.NewDesc(