diff --git a/jsonnet/kube-prometheus/prometheus-adapter/prometheus-adapter.libsonnet b/jsonnet/kube-prometheus/prometheus-adapter/prometheus-adapter.libsonnet
index 1e1c6b2a3198be474834729af3338e402365e1fa..f4459dbee6481cde2cd3218936613e5ba39a19be 100644
--- a/jsonnet/kube-prometheus/prometheus-adapter/prometheus-adapter.libsonnet
+++ b/jsonnet/kube-prometheus/prometheus-adapter/prometheus-adapter.libsonnet
@@ -16,7 +16,7 @@ local k = import 'github.com/ksonnet/ksonnet-lib/ksonnet.beta.4/k.libsonnet';
       name: 'prometheus-adapter',
       namespace: $._config.namespace,
       labels: { name: $._config.prometheusAdapter.name },
-      prometheusURL: 'http://prometheus-' + $._config.prometheus.name + '.' + $._config.prometheusAdapter.namespace + '.svc.cluster.local:9090/',
+      prometheusURL: 'http://prometheus-' + $._config.prometheus.name + '.' + $._config.namespace + '.svc.cluster.local:9090/',
       config: {
         resourceRules: {
           cpu: {