diff --git a/jsonnet/kube-prometheus/prometheus/prometheus.libsonnet b/jsonnet/kube-prometheus/prometheus/prometheus.libsonnet
index 198260213156ec121cfc4574f94fde0a14a413a8..42f9191150b78bc05c5d504ce8745e5e1cd7346d 100644
--- a/jsonnet/kube-prometheus/prometheus/prometheus.libsonnet
+++ b/jsonnet/kube-prometheus/prometheus/prometheus.libsonnet
@@ -182,6 +182,7 @@ local k = import 'ksonnet/ksonnet.beta.4/k.libsonnet';
           serviceMonitorSelector: {},
           podMonitorSelector: {},
           serviceMonitorNamespaceSelector: {},
+          podMonitorNamespaceSelector: {},
           nodeSelector: { 'kubernetes.io/os': 'linux' },
           ruleSelector: selector.withMatchLabels({
             role: 'alert-rules',