diff --git a/pkgs/by-name/li/libnest2d/package.nix b/pkgs/by-name/li/libnest2d/package.nix
index eec7acc9f86c..a43427264c93 100644
--- a/pkgs/by-name/li/libnest2d/package.nix
+++ b/pkgs/by-name/li/libnest2d/package.nix
@@ -37,7 +37,8 @@ stdenv.mkDerivation {
   ];
   nativeBuildInputs = [ cmake ];
 
-  CLIPPER_PATH = "${clipper.out}";
+  env.CLIPPER_PATH = clipper.out;
+
   cmakeFlags = [ "-DLIBNEST2D_HEADER_ONLY=OFF" ];
 
   meta = {