diff --git a/www/video-rtc.js b/www/video-rtc.js
index 11827bc1..d4c870a3 100644
--- a/www/video-rtc.js
+++ b/www/video-rtc.js
@@ -315,8 +315,8 @@ class VideoRTC extends HTMLElement {
             }, delay);
         });
 
-        if ("MediaSource" in window && this.MSE2) {
-            if (MediaSource.canConstructInDedicatedWorker) {
+        if ("MediaSource" in window) {
+            if (MediaSource.canConstructInDedicatedWorker && this.MSE2) {
                 this.internalMSE2();
             } else {
                 this.internalMSE();