diff --git a/networking/p2p/src/main/java/tech/pegasys/teku/networking/p2p/network/config/NetworkConfig.java b/networking/p2p/src/main/java/tech/pegasys/teku/networking/p2p/network/config/NetworkConfig.java
index 7f506cd9e57..2dce9abd3d5 100644
--- a/networking/p2p/src/main/java/tech/pegasys/teku/networking/p2p/network/config/NetworkConfig.java
+++ b/networking/p2p/src/main/java/tech/pegasys/teku/networking/p2p/network/config/NetworkConfig.java
@@ -313,14 +313,14 @@ public Builder listenPort(final int listenPort) {
     }
 
     public Builder listenPortIpv6(final int listenPortIpv6) {
-      validatePort(listenPortIpv6, "-Xp2p-port-ipv6");
+      validatePort(listenPortIpv6, "--Xp2p-port-ipv6");
       this.listenPortIpv6 = listenPortIpv6;
       return this;
     }
 
     public Builder advertisedPort(final OptionalInt advertisedPort) {
       checkNotNull(advertisedPort);
-      advertisedPort.ifPresent(port -> validatePort(port, "--p2p-advertised-ip"));
+      advertisedPort.ifPresent(port -> validatePort(port, "--p2p-advertised-port"));
       this.advertisedPort = advertisedPort;
       return this;
     }