diff --git a/code-samples/eventing/bookstore-sample-app/solution/db-service/200-create-postgre.yaml b/code-samples/eventing/bookstore-sample-app/solution/db-service/200-create-postgre.yaml
index 8384d2ed943..c14933e5d4f 100644
--- a/code-samples/eventing/bookstore-sample-app/solution/db-service/200-create-postgre.yaml
+++ b/code-samples/eventing/bookstore-sample-app/solution/db-service/200-create-postgre.yaml
@@ -7,6 +7,7 @@ spec:
   selector:
     matchLabels:
       app: postgresql
+  serviceName: postgresql
   template:
     metadata:
       labels:
diff --git a/code-samples/eventing/bookstore-sample-app/start/db-service/200-create-postgre.yaml b/code-samples/eventing/bookstore-sample-app/start/db-service/200-create-postgre.yaml
index 8384d2ed943..c14933e5d4f 100644
--- a/code-samples/eventing/bookstore-sample-app/start/db-service/200-create-postgre.yaml
+++ b/code-samples/eventing/bookstore-sample-app/start/db-service/200-create-postgre.yaml
@@ -7,6 +7,7 @@ spec:
   selector:
     matchLabels:
       app: postgresql
+  serviceName: postgresql
   template:
     metadata:
       labels: