diff --git a/Makefile b/Makefile
index c10c15d..da13647 100644
--- a/Makefile
+++ b/Makefile
@@ -17,10 +17,14 @@ hoogle:
 	hoogle server --local -p 8081 >> /dev/null &
 	hoogle server --local --database=hoo/local.hoo -p 8082 >> /dev/null &
 
-FORMAT_EXTENSIONS := -o -XQuasiQuotes -o -XTemplateHaskell -o -XTypeApplications -o -XImportQualifiedPost -o -XPatternSynonyms -o -XOverloadedRecordDot
-format:
-	find -name '*.hs' -not -path './dist-*/*' | xargs fourmolu $(FORMAT_EXTENSIONS) -m inplace
+format: format_haskell format_nix
+
+format_nix:
 	git ls-tree -r HEAD --full-tree --name-only | grep -E '.*\.nix' | xargs nixpkgs-fmt
+
+FORMAT_EXTENSIONS := -o -XQuasiQuotes -o -XTemplateHaskell -o -XTypeApplications -o -XImportQualifiedPost -o -XPatternSynonyms -o -XOverloadedRecordDot
+format_haskell:
+	find -name '*.hs' -not -path './dist-*/*' | xargs fourmolu $(FORMAT_EXTENSIONS) -m inplace
 	git ls-tree -r HEAD --full-tree --name-only | grep -E '.*\.cabal' | xargs cabal-fmt -i
 
 format_check: