diff --git a/cardano-cli/src/Cardano/CLI/EraBased/Run/Query.hs b/cardano-cli/src/Cardano/CLI/EraBased/Run/Query.hs
index d6c5d9ebc..b974969d9 100644
--- a/cardano-cli/src/Cardano/CLI/EraBased/Run/Query.hs
+++ b/cardano-cli/src/Cardano/CLI/EraBased/Run/Query.hs
@@ -753,7 +753,7 @@ runQueryRefScriptSizeCmd
 
 newtype RefInputScriptSize = RefInputScriptSize {refInputScriptSize :: Int}
   deriving Generic
-  deriving anyclass (ToJSON)
+  deriving anyclass ToJSON
 
 instance Pretty RefInputScriptSize where
   pretty (RefInputScriptSize s) = "Reference inputs scripts size is" <+> pretty s <+> "bytes."