diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 7e99300a41e..de90184ac09 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -1,6 +1,7 @@
 { stdenv, fetchurl, ghc, pkgconfig, glibcLocales, coreutils, gnugrep, gnused
 , jailbreak-cabal, hscolour, cpphs, nodejs, lib, removeReferencesTo
-}: let isCross = (ghc.cross or null) != null; in
+}:
+let isCross = (ghc.cross or null) != null; in
 
 { pname
 , dontStrip ? (ghc.isGhcjs or false)
diff --git a/pkgs/development/haskell-modules/make-package-set.nix b/pkgs/development/haskell-modules/make-package-set.nix
index 87f3a04ebf5..5215fe4a552 100644
--- a/pkgs/development/haskell-modules/make-package-set.nix
+++ b/pkgs/development/haskell-modules/make-package-set.nix
@@ -25,7 +25,9 @@
 }:
 
 # return value: a function from self to the package set
-self: let
+self:
+
+let
 
   inherit (stdenv.lib) fix' extends makeOverridable;
   inherit (haskellLib) overrideCabal;