diff --git a/plugin/notes/speaker-view.html b/plugin/notes/speaker-view.html
index 3cf492db1a9..0c77390caea 100644
--- a/plugin/notes/speaker-view.html
+++ b/plugin/notes/speaker-view.html
@@ -368,6 +368,10 @@ <h4 class="label">Notes</h4>
 
 				window.addEventListener( 'message', function( event ) {
 
+					if (window.location.origin !== event.origin){
+						return;
+					}
+
 					clearTimeout( connectionTimeout );
 					connectionStatus.style.display = 'none';