diff --git a/wp-includes/css/media-views.css b/wp-includes/css/media-views.css
index bd96ec2c5a..43061561a8 100644
--- a/wp-includes/css/media-views.css
+++ b/wp-includes/css/media-views.css
@@ -578,6 +578,7 @@
 .media-frame .media-iframe iframe {
 	height: 100%;
 	width: 100%;
+	border: 0;
 }
 
 /**