diff --git a/Makefile b/Makefile
index 90ae380..c10c15d 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ hoogle:
 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
-	git ls-tree -r HEAD --full-tree --name-only | grep -E '.*\.nix' | xargs nixfmt
+	git ls-tree -r HEAD --full-tree --name-only | grep -E '.*\.nix' | xargs nixpkgs-fmt
 	git ls-tree -r HEAD --full-tree --name-only | grep -E '.*\.cabal' | xargs cabal-fmt -i
 
 format_check: