diff --git a/pkgs/development/libraries/aqbanking/libchipcard.nix b/pkgs/development/libraries/aqbanking/libchipcard.nix
index 1ac00c3fe88..9a0b70e0d97 100644
--- a/pkgs/development/libraries/aqbanking/libchipcard.nix
+++ b/pkgs/development/libraries/aqbanking/libchipcard.nix
@@ -1,11 +1,12 @@
 { stdenv, fetchurl, pkgconfig, gwenhywfar, pcsclite, zlib }:
 
-stdenv.mkDerivation rec {
+let
+  inherit ((import ./sources.nix).libchipcard) sha256 releaseId version;
+in stdenv.mkDerivation rec {
   name = "libchipcard-${version}";
-  version = "5.0.4";
+  inherit version;
 
   src = let
-    inherit ((import ./sources.nix).libchipcard) sha256 releaseId;
     qstring = "package=02&release=${releaseId}&file=01";
     mkURLs = map (base: "${base}/sites/download/download.php?${qstring}");
   in fetchurl {