diff --git a/public/viewer.js b/public/viewer.js
index 072146e..5fe10dd 100644
--- a/public/viewer.js
+++ b/public/viewer.js
@@ -11,11 +11,20 @@ const peerConfig = { iceServers: [{ urls: "stun:stun.l.google.com:19302" }] };
 
 let signal;
 let peer;
-let viewerId = crypto.randomUUID();
+let viewerId = generateId();
 let retryTimer;
 let playPromise;
 let remoteStream;
 
+function generateId() {
+  const bytes = new Uint8Array(16);
+  crypto.getRandomValues(bytes);
+  bytes[6] = (bytes[6] & 0x0f) | 0x40;
+  bytes[8] = (bytes[8] & 0x3f) | 0x80;
+  const hex = Array.from(bytes, (b) => b.toString(16).padStart(2, "0")).join("");
+  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`;
+}
+
 player.muted = true;
 player.defaultMuted = true;