diff --git a/jsonnet/kube-prometheus/components/prometheus.libsonnet b/jsonnet/kube-prometheus/components/prometheus.libsonnet
index a9d0100ae351e5ea3f060aa322726ab79ee6c72d..9a6293891fc0b8a6a64219bc597683bdd372dc38 100644
--- a/jsonnet/kube-prometheus/components/prometheus.libsonnet
+++ b/jsonnet/kube-prometheus/components/prometheus.libsonnet
@@ -59,6 +59,7 @@ function(params) {
   mixinThanos::
     (import 'github.com/thanos-io/thanos/mixin/alerts/sidecar.libsonnet') +
     (import 'github.com/kubernetes-monitoring/kubernetes-mixin/lib/add-runbook-links.libsonnet') + {
+      _config+:: p._config.mixin._config,
       targetGroups: {},
       sidecar: {
         selector: p._config.mixin._config.thanosSelector,