diff --git a/pkgs/development/libraries/haskell/HList/default.nix b/pkgs/development/libraries/haskell/HList/default.nix
index 35b03f77dde6..df2bfcf1f798 100644
--- a/pkgs/development/libraries/haskell/HList/default.nix
+++ b/pkgs/development/libraries/haskell/HList/default.nix
@@ -1,9 +1,10 @@
-{ cabal }:
+{ cabal, diffutils }:
 
 cabal.mkDerivation (self: {
   pname = "HList";
   version = "0.2.3";
   sha256 = "1efbe0c2cb361ab0a9d864a09f9c58075132cb50094207260cb1363fe73c2908";
+  buildTools = [ diffutils ];
   meta = {
     description = "Heterogeneous lists";
     license = self.stdenv.lib.licenses.mit;