diff --git a/pkgs/top-level/release-haskell.nix b/pkgs/top-level/release-haskell.nix
index c6ac739f027e..a28c4e8a84ec 100644
--- a/pkgs/top-level/release-haskell.nix
+++ b/pkgs/top-level/release-haskell.nix
@@ -331,6 +331,8 @@ let
         nix-script
         nix-tree
         nixfmt
+        nixfmt-classic
+        nixfmt-rfc-style
         nota
         nvfetcher
         ormolu