diff --git a/modules/web/web.js b/modules/web/web.js
index 03d9a60..c5cec23 100644
--- a/modules/web/web.js
+++ b/modules/web/web.js
@@ -94,7 +94,7 @@ function wsSend(obj) {
 function handleMessage(msg) {
     if(msg.time && timeOffset != 0) {
         const now = performance.now() / 1000;
-        const lag = now - (msg.time + offset);
+        const lag = now - (msg.time + timeOffset);
         document.getElementById("ping-status").textContent = lag * 1000;
     }
     switch (msg.event) {