diff --git a/html5/verto/js/src/jquery.FSRTC.js b/html5/verto/js/src/jquery.FSRTC.js
index 54db1acd4b..691a938349 100644
--- a/html5/verto/js/src/jquery.FSRTC.js
+++ b/html5/verto/js/src/jquery.FSRTC.js
@@ -246,7 +246,7 @@
 	    // Hacks for Mobile Safari
 	    self.options.useVideo.setAttribute("playsinline", true);
 	    self.options.useVideo.setAttribute("controls", true);
-	    setTimeout(() => {
+	    setTimeout(function() {
 		self.options.useVideo.removeAttribute("controls");
 	    });