diff --git a/lib.nix b/lib.nix
index 05f70d8..449b2da 100644
--- a/lib.nix
+++ b/lib.nix
@@ -1,7 +1,8 @@
 { pkgs }:
 let
   inherit (pkgs) lib;
-  runtime = "$(pwd)/.compose";
+  pwd = builtins.getEnv "PWD";
+  runtime = "${pwd}/.compose";
 in
 {
   mkWrapper =