diff --git a/distribution-nixpkgs.cabal b/distribution-nixpkgs.cabal
--- a/distribution-nixpkgs.cabal
+++ b/distribution-nixpkgs.cabal
@@ -1,12 +1,12 @@
--- This file has been generated from package.yaml by hpack version 0.14.0.
+-- This file has been generated from package.yaml by hpack version 0.14.1.
 --
 -- see: https://github.com/sol/hpack
 
 name:           distribution-nixpkgs
-version:        1
+version:        1.0.0.1
 synopsis:       Types and functions to manipulate the Nixpkgs distribution.
 description:    Types and functions to represent, query, and manipulate the Nixpkgs distribution.
-category:       Distribution
+category:       Distribution, Nix
 homepage:       https://github.com/peti/distribution-nixpkgs#readme
 bug-reports:    https://github.com/peti/distribution-nixpkgs/issues
 maintainer:     Peter Simons <simons@cryp.to>
diff --git a/src/Language/Nix/PrettyPrinting.hs b/src/Language/Nix/PrettyPrinting.hs
--- a/src/Language/Nix/PrettyPrinting.hs
+++ b/src/Language/Nix/PrettyPrinting.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE PackageImports #-}
+
 -- | Internal pretty-printing helpers for Nix expressions.
 
 module Language.Nix.PrettyPrinting
@@ -20,7 +22,7 @@
 import Data.Set ( Set )
 import qualified Data.Set as Set
 import Distribution.Text ( Text, disp )
-import Text.PrettyPrint.HughesPJClass
+import "pretty" Text.PrettyPrint.HughesPJClass
 
 attr :: String -> Doc -> Doc
 attr n v = text n <+> equals <+> v <> semi