diff --git a/pkgs/development/libraries/irr1/default.nix b/pkgs/development/libraries/irr1/default.nix
index ba4a99b2bb80..8740919ce3ae 100644
--- a/pkgs/development/libraries/irr1/default.nix
+++ b/pkgs/development/libraries/irr1/default.nix
@@ -4,25 +4,25 @@
 , cmake
 }:
 
-stdenv.mkDerivation (self: {
+stdenv.mkDerivation rec {
   pname = "irr1";
   version = "1.9.4";
 
   src = fetchFromGitHub {
     owner = "berndporr";
     repo = "iir1";
-    rev = self.version;
+    rev = version;
     hash = "sha256-T8gl51IkZIGq+6D5ge4Kb3wm5aw7Rhphmnf6TTGwHbs=";
   };
 
   nativeBuildInputs = [ cmake ];
 
   meta = {
-    homepage = "http://berndporr.github.io/iir1/";
     description = "A DSP IIR realtime filter library written in C++";
-    changelog = "https://github.com/berndporr/iir1/releases/tag/${self.version}";
+    downloadPage = "https://github.com/berndporr/iir1";
+    homepage = "http://berndporr.github.io/iir1/";
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.AndersonTorres ];
     platforms = lib.platforms.unix;
   };
-})
+}