diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87687bd6..32d99ece 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## master / unreleased
 
+* [ENHANCEMENT] Add `appProtocol` field to templates/svc-memberlist-headless.yaml to fix issues wirth Istio #485
 * [ENHANCEMENT] Add option to autoscale on multiple metrics and custom metrics metrics #467
 * [ENHANCEMENT] Add control on store-gateway statefulset when autoscale (HPA) enabled or disabled #472
 * [DEPENDENCY] Update quay.io/cortexproject/cortex Docker tag to v1.15.0 #453
diff --git a/templates/svc-memberlist-headless.yaml b/templates/svc-memberlist-headless.yaml
index f0e1eb26..134104cf 100755
--- a/templates/svc-memberlist-headless.yaml
+++ b/templates/svc-memberlist-headless.yaml
@@ -16,6 +16,7 @@ spec:
   ports:
     - port: {{ .Values.config.memberlist.bind_port }}
       protocol: TCP
+      appProtocol: tcp
       name: gossip
       targetPort: gossip
   selector: