diff --git a/cardano-api/src/Cardano/Api/Block.hs b/cardano-api/src/Cardano/Api/Block.hs
index 0c557deb214..51917d04b49 100644
--- a/cardano-api/src/Cardano/Api/Block.hs
+++ b/cardano-api/src/Cardano/Api/Block.hs
@@ -2,6 +2,7 @@
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE RankNTypes #-}