diff --git a/eth/catalyst/simulated_beacon_test.go b/eth/catalyst/simulated_beacon_test.go
index 711e8f1d60..7db1769234 100644
--- a/eth/catalyst/simulated_beacon_test.go
+++ b/eth/catalyst/simulated_beacon_test.go
@@ -40,7 +40,7 @@ func startSimulatedBeaconEthService(t *testing.T, genesis *core.Genesis, period
 
 	n, err := node.New(&node.Config{
 		P2P: p2p.Config{
-			ListenAddr:  "127.0.0.1:8545",
+			ListenAddr:  "127.0.0.1:0",
 			NoDiscovery: true,
 			MaxPeers:    0,
 		},