diff --git a/nix-js/runtime-ts/src/builtins/functional.ts b/nix-js/runtime-ts/src/builtins/functional.ts
index 8a5dad9..74e3c93 100644
--- a/nix-js/runtime-ts/src/builtins/functional.ts
+++ b/nix-js/runtime-ts/src/builtins/functional.ts
@@ -41,7 +41,7 @@ export const throwFunc = (s: NixValue): never => {
 export const trace =
   (e1: NixValue) =>
   (e2: NixValue): NixValue => {
-    console.error(`trace: ${printValue(e1)}`);
+    console.error(`trace: ${printValue(force(e1))}`);
     return e2;
   };