diff --git a/eth/backend.go b/eth/backend.go
index a7a7b94364..b90e19ba75 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -351,7 +351,7 @@ func makeExtraData(extra []byte) []byte {
 		// create default extradata
 		extra, _ = rlp.EncodeToBytes([]interface{}{
 			uint(params.VersionMajor<<16 | params.VersionMinor<<8 | params.VersionPatch),
-			"geth",
+			"tomo",
 			runtime.Version(),
 			runtime.GOOS,
 		})