diff --git a/.github/format.sh b/.github/format.sh
index 3bea3de..2373ce1 100755
--- a/.github/format.sh
+++ b/.github/format.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 
-nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/tags/21.05.tar.gz \
-          -p haskellPackages.fourmolu \
-          --run 'make format_check'
+# Extensions necessary to tell fourmolu about 
+EXTENSIONS="-o -XTypeApplications -o -XTemplateHaskell -o -XImportQualifiedPost -o -XPatternSynonyms -o -fplugin=RecordDotPreprocessor"
+SOURCES=$(git ls-tree -r HEAD --full-tree --name-only | grep -E '.*\.hs')
+~/.local/bin/fourmolu --mode check --check-idempotence $EXTENSIONS $SOURCES
diff --git a/.gitignore b/.gitignore
index 9699888..5ae1889 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ result-*
 .vscode/
 .idea
 tags
+TAGS
 .nvimrc
 
 *.tix
diff --git a/src/Agora/AuthorityToken.hs b/src/Agora/AuthorityToken.hs
index bbd2849..4b59f8d 100644
--- a/src/Agora/AuthorityToken.hs
+++ b/src/Agora/AuthorityToken.hs
@@ -24,7 +24,7 @@ import Plutarch.Prelude
      said transaction. Said validator should be made aware of
      _this_ token's existence in order to prevent incorrect minting.
 -}
-data AuthorityToken = AuthorityToken
+newtype AuthorityToken = AuthorityToken
   { -- | Token that must move in order for minting this to be valid.
     authority :: AssetClass
   }