diff --git a/client/operation.go b/client/operation.go
index c165cb8..8686c8a 100644
--- a/client/operation.go
+++ b/client/operation.go
@@ -297,12 +297,11 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 							logger.Println("unmarshal metric failed :", err, string(metricBuffer))
 							continue
 						}
-						if index != 0 {
-							if desc.ConstLabels == nil {
-								desc.ConstLabels = make(map[string]string)
-							}
-							desc.ConstLabels["index"] = fmt.Sprintf("%d", index)
+
+						if desc.ConstLabels == nil {
+							desc.ConstLabels = make(map[string]string)
 						}
+						desc.ConstLabels["index"] = fmt.Sprintf("%d", index)
 
 						metricExporter.RegisterMetric(&desc)
 					} else {