diff --git a/nodes/prometheus.go b/nodes/prometheus.go
index e83fe01..6d1d319 100644
--- a/nodes/prometheus.go
+++ b/nodes/prometheus.go
@@ -6,8 +6,8 @@ import (
 )
 
 type prometheusDiscovery struct {
-	Labels  Labels   `json:"Labels"`
-	Targets []string `json:"Targets"`
+	Labels  map[string]string `json:"Labels"`
+	Targets []string          `json:"Targets"`
 }
 
 func GetPrometheusSD(p *NodesProcessor, ss string) []prometheusDiscovery {
@@ -15,7 +15,7 @@ func GetPrometheusSD(p *NodesProcessor, ss string) []prometheusDiscovery {
 
 	pds := []prometheusDiscovery{
 		{
-			Labels:  Labels{},
+			Labels:  make(map[string]string),
 			Targets: []string{},
 		},
 	}