diff --git a/pkgs/applications/audio/monkeys-audio/default.nix b/pkgs/applications/audio/monkeys-audio/default.nix
index e0d3504bdbcd..bb11921823ca 100644
--- a/pkgs/applications/audio/monkeys-audio/default.nix
+++ b/pkgs/applications/audio/monkeys-audio/default.nix
@@ -4,13 +4,13 @@
 , cmake
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   version = "10.22";
   pname = "monkeys-audio";
 
   src = fetchzip {
     url = "https://monkeysaudio.com/files/MAC_${
-      builtins.concatStringsSep "" (lib.strings.splitString "." version)}_SDK.zip";
+      builtins.concatStringsSep "" (lib.strings.splitString "." finalAttrs.version)}_SDK.zip";
     sha256 = "sha256-JmDH9IudtuJdu1kSDI1RNaYiIgmPgH4RT2Myz9ihQH4=";
     stripRoot = false;
   };
@@ -28,4 +28,4 @@ stdenv.mkDerivation rec {
     license = licenses.free;
     maintainers = with maintainers; [ doronbehar ];
   };
-}
+})