diff --git a/jsonnet/kube-prometheus/components/alertmanager.libsonnet b/jsonnet/kube-prometheus/components/alertmanager.libsonnet
index 5e992176db4c1912edb1bdfbbdfc7645203ecc3f..27f4ff1bc4e19df2804cce5335770e27d98ee9fe 100644
--- a/jsonnet/kube-prometheus/components/alertmanager.libsonnet
+++ b/jsonnet/kube-prometheus/components/alertmanager.libsonnet
@@ -82,7 +82,7 @@ function(params) {
     kind: 'PrometheusRule',
     metadata: {
       labels: am.config.commonLabels + am.config.mixin.ruleLabels,
-      name: am.config.name + '-rules',
+      name: 'alertmanager-' + am.config.name + '-rules',
       namespace: am.config.namespace,
     },
     spec: {