diff --git a/packages/webui/src/user-bus.mjs b/packages/webui/src/user-bus.mjs
index 29c6302bf..9a4b344ee 100644
--- a/packages/webui/src/user-bus.mjs
+++ b/packages/webui/src/user-bus.mjs
@@ -18,7 +18,7 @@ export function userCall({ socket, business, user, env = process.env, timeoutMs
   return (verb, args = {}) => new Promise((resolve, reject) => {
     let child;
     try {
-      child = spawn(process.execPath, [USER_CLI, socket], { env: { ...rest, MOSAIC_BUS_USER_NONCE: randomBytes(32).toString('hex') }, stdio: ['pipe', 'pipe', 'pipe'] });
+      child = spawn(process.execPath, [USER_CLI, socket], { env: { ...env, MOSAIC_BUS_USER_NONCE: randomBytes(32).toString('hex') }, stdio: ['pipe', 'pipe', 'pipe'] });
     } catch { return reject(new BusReadError('outcome-unknown', 'the bus transport did not start')); }
     const out = [], err = [];
     let size = 0, settled = false;