diff --git a/simulcast.js b/simulcast.js
index 860b9fa43..ef050f828 100644
--- a/simulcast.js
+++ b/simulcast.js
@@ -137,7 +137,7 @@ SimulcastUtils.prototype.parseMedia = function (lines, mediatypes) {
             lines[i].substring(0, 'a=sendonly'.length) === 'a=sendonly' ||
             lines[i].substring(0, 'a=inactive'.length) === 'a=inactive')) {
 
-            cur_media.direction = lines[i].substring('a='.length, 8);
+            cur_media.direction = lines[i].substring('a='.length);
         }
     }
 
@@ -1254,4 +1254,4 @@ $(document).bind('startsimulcastlayer', function (event, simulcastLayer) {
 $(document).bind('stopsimulcastlayer', function (event, simulcastLayer) {
     var ssrc = simulcastLayer.primarySSRC;
     simulcast._setLocalVideoStreamEnabled(ssrc, false);
-});
\ No newline at end of file
+});