diff --git a/apps/darts-modernisation/darts-gateway/demo.yaml b/apps/darts-modernisation/darts-gateway/demo.yaml
index 432c2af342..b4cff7bf07 100644
--- a/apps/darts-modernisation/darts-gateway/demo.yaml
+++ b/apps/darts-modernisation/darts-gateway/demo.yaml
@@ -8,7 +8,7 @@ spec:
   values:
     java:
       ingressHost: darts-gateway.demo.platform.hmcts.net
-      additionalIngressHosts: darts-proxy.demo.platform.hmcts.net
+      additionalIngressHosts: ["darts-proxy.demo.platform.hmcts.net"]
       environment:
         DARTS_LOG_LEVEL: INFO
         DARTS_SOAP_REQUEST_LOG_LEVEL: TRACE