diff --git a/integration/localnet/builder/bootstrap.go b/integration/localnet/builder/bootstrap.go
index f41b5682b95..305f7472f1a 100644
--- a/integration/localnet/builder/bootstrap.go
+++ b/integration/localnet/builder/bootstrap.go
@@ -465,7 +465,7 @@ func prepareObserverService(i int, observerName string, agPublicKey string) Serv
 		fmt.Sprintf("--upstream-node-addresses=%s:%s", testnet.PrimaryAN, testnet.GRPCSecurePort),
 		fmt.Sprintf("--upstream-node-public-keys=%s", agPublicKey),
 		fmt.Sprintf("--observer-networking-key-path=/bootstrap/private-root-information/%s_key", observerName),
-		"--bind=0.0.0.0:0",
+		"--bind=0.0.0.0:3569",
 		fmt.Sprintf("--rpc-addr=%s:%s", observerName, testnet.GRPCPort),
 		fmt.Sprintf("--secure-rpc-addr=%s:%s", observerName, testnet.GRPCSecurePort),
 		fmt.Sprintf("--http-addr=%s:%s", observerName, testnet.GRPCWebPort),
diff --git a/integration/testnet/network.go b/integration/testnet/network.go
index ab2b942055a..3c9e3da630c 100644
--- a/integration/testnet/network.go
+++ b/integration/testnet/network.go
@@ -740,7 +740,7 @@ func (net *FlowNetwork) addObserver(t *testing.T, conf ObserverConfig) {
 			Image: "gcr.io/flow-container-registry/observer:latest",
 			User:  currentUser(),
 			Cmd: append([]string{
-				"--bind=0.0.0.0:0",
+				"--bind=0.0.0.0:3569",
 				fmt.Sprintf("--bootstrapdir=%s", DefaultBootstrapDir),
 				fmt.Sprintf("--datadir=%s", DefaultFlowDBDir),
 				fmt.Sprintf("--secretsdir=%s", DefaultFlowSecretsDBDir),