diff --git a/index.js b/index.js
index 0fbc6736..f0f98b11 100644
--- a/index.js
+++ b/index.js
@@ -695,7 +695,7 @@ Peer.prototype._transformConstraints = function (constraints) {
     return constraints
   }
 
-  if ((constraints.mandatory || constraints.optional) && self._isChromium) {
+  if ((constraints.mandatory || constraints.optional) && !self._isChromium) {
     // convert to new format
 
     // Merge mandatory and optional objects, prioritizing mandatory