diff --git a/cardano-cli/src/Cardano/CLI/EraBased/Run/Transaction.hs b/cardano-cli/src/Cardano/CLI/EraBased/Run/Transaction.hs
index 2c1d4ad94d..841e766241 100644
--- a/cardano-cli/src/Cardano/CLI/EraBased/Run/Transaction.hs
+++ b/cardano-cli/src/Cardano/CLI/EraBased/Run/Transaction.hs
@@ -1073,7 +1073,7 @@ convertCertificates sbe certsAndScriptWitnesses =
   TxCertificates sbe certs $ BuildTxWith reqWits
  where
   certs = map fst certsAndScriptWitnesses
-  reqWits = Map.fromList $ mapMaybe convert certsAndScriptWitnesses
+  reqWits = mapMaybe convert certsAndScriptWitnesses
   convert
     :: (Certificate era, Maybe (ScriptWitness WitCtxStake era))
     -> Maybe (StakeCredential, Witness WitCtxStake era)