diff --git a/cardano-cli/src/Cardano/CLI/EraBased/Run/Genesis/CreateTestnetData.hs b/cardano-cli/src/Cardano/CLI/EraBased/Run/Genesis/CreateTestnetData.hs
index 82e072fe83..f1312739eb 100644
--- a/cardano-cli/src/Cardano/CLI/EraBased/Run/Genesis/CreateTestnetData.hs
+++ b/cardano-cli/src/Cardano/CLI/EraBased/Run/Genesis/CreateTestnetData.hs
@@ -392,7 +392,7 @@ runGenesisCreateTestNetDataCmd
     void $ writeFileGenesis byronGenesisFp $ WritePretty defaultByronProtocolParamsJsonValue
 
     let byronGenesisParameters = mkByronGenesisParameters actualNetworkWord32 byronGenesisFp shelleyGenesis'
-        byronOutputDir = outputDir </> "byron-gen-command"
+        byronOutputDir = outputDir </> "b"
         dumpGenesis = Byron.DumpGenesis False False True True True False
     (byronGenesis, byronSecrets) <-
       firstExceptT GenesisCmdByronError $ Byron.mkGenesis byronGenesisParameters