diff --git a/jsonnet/kube-prometheus/components/prometheus.libsonnet b/jsonnet/kube-prometheus/components/prometheus.libsonnet
index 461a4253f0d5c44c75e25939655548f3abb70510..7306849f640a0ee4fd2880ee6a46d16058d7a429 100644
--- a/jsonnet/kube-prometheus/components/prometheus.libsonnet
+++ b/jsonnet/kube-prometheus/components/prometheus.libsonnet
@@ -116,6 +116,18 @@ function(params) {
           port: o.port,
           protocol: 'TCP',
         }, p.service.spec.ports),
+      }, {
+        from: [{
+          podSelector: {
+            matchLabels: {
+              'app.kubernetes.io/name': 'grafana',
+            },
+          },
+        }],
+        ports: [{
+          port: 9090,
+          protocol: 'TCP',
+        }],
       }],
     },
   },
diff --git a/manifests/prometheus-networkPolicy.yaml b/manifests/prometheus-networkPolicy.yaml
index f7a9010da2192e28017c955c1d5f8a1a13a3121a..c2eec26e8918fe43a356deb80e9f8c93371931f6 100644
--- a/manifests/prometheus-networkPolicy.yaml
+++ b/manifests/prometheus-networkPolicy.yaml
@@ -22,6 +22,13 @@ spec:
       protocol: TCP
     - port: 8080
       protocol: TCP
+  - from:
+    - podSelector:
+        matchLabels:
+          app.kubernetes.io/name: grafana
+    ports:
+    - port: 9090
+      protocol: TCP
   podSelector:
     matchLabels:
       app.kubernetes.io/component: prometheus