diff --git a/pkgs/by-name/dy/dynamic-colors/package.nix b/pkgs/by-name/dy/dynamic-colors/package.nix
index 2d453bcab36d..7613f54bd019 100644
--- a/pkgs/by-name/dy/dynamic-colors/package.nix
+++ b/pkgs/by-name/dy/dynamic-colors/package.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-jSdwq9WwYZP8MK6z7zJa0q93xfanr6iuvAt8YQkQxxE=";
   };
 
-  PREFIX = placeholder "out";
+  env.PREFIX = placeholder "out";
 
   postPatch = ''
     substituteInPlace bin/dynamic-colors \