diff --git a/pkgs/applications/audio/dirt/default.nix b/pkgs/applications/audio/dirt/default.nix
index c50f85e96ae..6d56f53bd16 100644
--- a/pkgs/applications/audio/dirt/default.nix
+++ b/pkgs/applications/audio/dirt/default.nix
@@ -13,9 +13,7 @@ stdenv.mkDerivation rec {
   postPatch = ''
     sed -i "s|./samples|$out/share/dirt/samples|" dirt.c
   '';
-  configurePhase = ''
-    export PREFIX=$out
-  '';
+  makeFlags = ["PREFIX=$(out)"];
   postInstall = ''
     mkdir -p $out/share/dirt/
     cp -r samples $out/share/dirt/