diff --git a/mkClojureLib.nix b/mkClojureLib.nix
index 50d0eff..6a388ab 100644
--- a/mkClojureLib.nix
+++ b/mkClojureLib.nix
@@ -43,7 +43,8 @@ in stdenv.mkDerivation {
         :srcs    ${concatStringsSep "," src-paths} \
         :target  ${target}
     '';
-  in "${builtins.trace script script}";
+    script-call = "${script}";
+  in builtins.trace script-call script-call;
 
   installPhase = ''
     mv ${target}/${name}-${version}-standalone.jar $out