diff --git a/public/app.js b/public/app.js
index 8d5e15a..13baca4 100644
--- a/public/app.js
+++ b/public/app.js
@@ -49,9 +49,8 @@ socket.on('viewer', id => {
         .createOffer()
         .then(sdp => {
             // Force VP8/H264 on the SDP offer to maximize compatibility with Chromium
-            const RTCRtpSender = RTCRtpSender || window.RTCRtpSender;
-            if (RTCRtpSender && RTCRtpSender.getCapabilities) {
-                const capabilities = RTCRtpSender.getCapabilities('video');
+            if (window.RTCRtpSender && window.RTCRtpSender.getCapabilities) {
+                const capabilities = window.RTCRtpSender.getCapabilities('video');
                 if (capabilities && capabilities.codecs) {
                     const preferredCodecs = capabilities.codecs.filter(c => 
                         c.mimeType.toLowerCase() === 'video/vp8' ||