diff --git a/src/js/tech/flash-rtmp.js b/src/js/tech/flash-rtmp.js
index 6bff49f48a..0d9a83f15a 100644
--- a/src/js/tech/flash-rtmp.js
+++ b/src/js/tech/flash-rtmp.js
@@ -22,7 +22,7 @@ function FlashRtmpDecorator(Flash) {
     // Look for the normal URL separator we expect, '&'.
     // If found, we split the URL into two pieces around the
     // first '&'.
-    let connEnd = src.indexOf('&');
+    let connEnd = src.search(/&(?!\w+=)/);
     let streamBegin;
     if (connEnd !== -1) {
       streamBegin = connEnd + 1;