diff --git a/eth/protocol.go b/eth/protocol.go
index a0ab177cdc..844641d04f 100644
--- a/eth/protocol.go
+++ b/eth/protocol.go
@@ -14,7 +14,7 @@ import (
 
 const (
 	ProtocolVersion    = 60
-	NetworkId          = 0
+	NetworkId          = 3
 	ProtocolLength     = uint64(8)
 	ProtocolMaxMsgSize = 10 * 1024 * 1024
 	maxHashes          = 256