diff --git a/pkgs/by-name/zi/zita-convolver/package.nix b/pkgs/by-name/zi/zita-convolver/package.nix
index 6320c11050b8..6d820aa5038f 100644
--- a/pkgs/by-name/zi/zita-convolver/package.nix
+++ b/pkgs/by-name/zi/zita-convolver/package.nix
@@ -1,22 +1,24 @@
 {
   lib,
   stdenv,
-  fetchurl,
+  fetchzip,
   fftwFloat,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "zita-convolver";
   version = "4.0.3";
-  src = fetchurl {
-    url = "http://kokkinizita.linuxaudio.org/linuxaudio/downloads/${pname}-${version}.tar.bz2";
-    sha256 = "0prji66p86z2bzminywkwchr5bfgxcg2i8y803pydd1hzf2198cs";
+
+  src = fetchzip {
+    url = "https://kokkinizita.linuxaudio.org/linuxaudio/downloads/zita-convolver-4.0.3.tar.bz2";
+    hash = "sha256-f8a3sLcN6GMPV/8E/faqMYkJdUa7WqmQBrehH6kCJtc=";
   };
 
+  sourceRoot = "${finalAttrs.src.name}/source";
+
   buildInputs = [ fftwFloat ];
 
   patchPhase = ''
-    cd source
     sed -e "s@ldconfig@@" -i Makefile
   '';
 
@@ -27,15 +29,16 @@ stdenv.mkDerivation rec {
 
   postInstall = ''
     # create lib link for building apps
-    ln -s $out/lib/libzita-convolver.so.${version} $out/lib/libzita-convolver.so.${lib.versions.major version}
+    ln -s \
+     $out/lib/libzita-convolver.so.${finalAttrs.version} \
+     $out/lib/libzita-convolver.so.${lib.versions.major finalAttrs.version}
   '';
 
   meta = {
     description = "Convolution library by Fons Adriaensen";
-    version = version;
-    homepage = "http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html";
-    license = lib.licenses.gpl2;
+    homepage = "https://kokkinizita.linuxaudio.org/linuxaudio/index.html";
+    license = lib.licenses.gpl3Only;
     maintainers = [ lib.maintainers.magnetophon ];
     platforms = lib.platforms.linux;
   };
-}
+})