diff --git a/lib/player.js b/lib/player.js
index 3b35574395..a78439dca9 100644
--- a/lib/player.js
+++ b/lib/player.js
@@ -1425,7 +1425,7 @@ shaka.Player.prototype.onBuffering_ = function(buffering) {
   this.updateStats_();
   this.buffering_ = buffering;
 
-  var event = new shaka.util.FakeEvent('buffering', { buffering: buffering });
+  var event = new shaka.util.FakeEvent('buffering', { 'buffering': buffering });
   this.dispatchEvent(event);
 };
 
@@ -1683,7 +1683,7 @@ shaka.Player.prototype.onTextTrackVisibility_ = function() {
 shaka.Player.prototype.onError_ = function(error) {
   goog.asserts.assert(error instanceof shaka.util.Error, 'Wrong error type!');
 
-  var event = new shaka.util.FakeEvent('error', { detail: error });
+  var event = new shaka.util.FakeEvent('error', { 'detail': error });
   this.dispatchEvent(event);
 };