diff --git a/pkgs/development/compilers/dart/package-source-builders/flutter_volume_controller/default.nix b/pkgs/development/compilers/dart/package-source-builders/flutter_volume_controller/default.nix
index b582ac0448c0..cfb883473bcd 100644
--- a/pkgs/development/compilers/dart/package-source-builders/flutter_volume_controller/default.nix
+++ b/pkgs/development/compilers/dart/package-source-builders/flutter_volume_controller/default.nix
@@ -1,11 +1,10 @@
 {
   stdenv,
-  mdk-sdk,
 }:
 
 { version, src, ... }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "flutter_volume_controller";
   inherit version src;
   inherit (src) passthru;
@@ -18,8 +17,10 @@ stdenv.mkDerivation rec {
 
   installPhase = ''
     runHook preInstall
+
     mkdir $out
     cp -r ./* $out/
+
     runHook postInstall
   '';
 }