diff --git a/cardano-api/src/Cardano/Api.hs b/cardano-api/src/Cardano/Api.hs
index d765bc9d45..08f681038a 100644
--- a/cardano-api/src/Cardano/Api.hs
+++ b/cardano-api/src/Cardano/Api.hs
@@ -727,6 +727,7 @@ module Cardano.Api
 
     -- **** Byron Genesis Config
   , readByronGenesisConfig
+  , GenesisHashByron (..)
 
     -- **** Shelley Genesis Config
   , ShelleyConfig (..)