diff --git a/pkgs/applications/misc/diffpdf/default.nix b/pkgs/applications/misc/diffpdf/default.nix
index 37ed8eb23fb6..957d3ee72bbb 100644
--- a/pkgs/applications/misc/diffpdf/default.nix
+++ b/pkgs/applications/misc/diffpdf/default.nix
@@ -1,6 +1,6 @@
-{ stdenv, fetchurl, fetchpatch, qmake, qttools, qtbase, poppler }:
+{ stdenv, mkDerivation, fetchurl, fetchpatch, qmake, qttools, qtbase, poppler }:
 
-stdenv.mkDerivation rec {
+mkDerivation rec {
   version = "2.1.3";
   pname = "diffpdf";