diff --git a/nixos/modules/services/printing/cupsd.nix b/nixos/modules/services/printing/cupsd.nix
index b19cd073252..d2b36d9e754 100644
--- a/nixos/modules/services/printing/cupsd.nix
+++ b/nixos/modules/services/printing/cupsd.nix
@@ -104,7 +104,7 @@ let
     ignoreCollisions = true;
   };
 
-  filterGutenprint = pkgs: filter (pkg: pkg.meta.isGutenprint or false == true) pkgs;
+  filterGutenprint = filter (pkg: pkg.meta.isGutenprint or false == true);
   containsGutenprint = pkgs: length (filterGutenprint pkgs) > 0;
   getGutenprint = pkgs: head (filterGutenprint pkgs);
 
diff --git a/pkgs/misc/cups/drivers/canon/default.nix b/pkgs/misc/cups/drivers/canon/default.nix
index 754c0f4d1d0..0d6ec276b5f 100644
--- a/pkgs/misc/cups/drivers/canon/default.nix
+++ b/pkgs/misc/cups/drivers/canon/default.nix
@@ -1,4 +1,5 @@
-{lib, stdenv, fetchurl, unzip, autoreconfHook, libtool, makeWrapper, cups, ghostscript, pkgsi686Linux, zlib }:
+{ lib, stdenv, fetchurl, unzip, autoreconfHook, libtool, makeWrapper, cups
+, ghostscript, pkgsi686Linux, zlib }:
 
 let
 
@@ -20,7 +21,7 @@ in
 
 stdenv.mkDerivation {
   pname = "canon-cups-ufr2";
-  version = version;
+  inherit version;
   src = src_canon;
 
   phases = [ "unpackPhase" "installPhase" ];
diff --git a/pkgs/misc/cups/drivers/hll2340dw/default.nix b/pkgs/misc/cups/drivers/hll2340dw/default.nix
index 35d81b3da00..e61d3ace5f1 100644
--- a/pkgs/misc/cups/drivers/hll2340dw/default.nix
+++ b/pkgs/misc/cups/drivers/hll2340dw/default.nix
@@ -1,4 +1,6 @@
-{lib, stdenv, fetchurl, cups, dpkg, gnused, makeWrapper, ghostscript, file, a2ps, coreutils, gawk, perl, gnugrep, which}:
+{ lib, stdenv, fetchurl, cups, dpkg, gnused, makeWrapper, ghostscript, file
+, a2ps, coreutils, perl, gnugrep, which
+}:
 
 let
   version = "3.2.0-1";