diff --git a/pkgs/applications/audio/aucatctl/default.nix b/pkgs/applications/audio/aucatctl/default.nix
index 6670e06a21dd..cf53a20700a5 100644
--- a/pkgs/applications/audio/aucatctl/default.nix
+++ b/pkgs/applications/audio/aucatctl/default.nix
@@ -1,11 +1,11 @@
 { lib, stdenv, fetchurl, sndio, libbsd }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "aucatctl";
   version = "0.1";
 
   src = fetchurl {
-    url = "http://www.sndio.org/${pname}-${version}.tar.gz";
+    url = "http://www.sndio.org/${finalAttrs.pname}-${finalAttrs.version}.tar.gz";
     sha256 = "524f2fae47db785234f166551520d9605b9a27551ca438bd807e3509ce246cf0";
   };
 
@@ -27,11 +27,10 @@ stdenv.mkDerivation rec {
     '';
 
   meta = with lib; {
-    description =
-      "The aucatctl utility sends MIDI messages to control sndiod and/or aucat volumes";
+    description = "The aucatctl utility sends MIDI messages to control sndiod and/or aucat volumes";
     homepage = "http://www.sndio.org";
     license = licenses.isc;
     maintainers = with maintainers; [ sna ];
     platforms = platforms.unix;
   };
-}
+})