diff --git a/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css b/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
index d5badccb2a..39af33835f 100644
--- a/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
+++ b/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
@@ -333,11 +333,11 @@ audio {
 .wpview-wrap .wpview-loading ins {
 	background-color: #333;
 	margin: 0 0 0 -60px;
-	width: 60px;
+	width: 36px;
 	height: 5px;
 	display: block;
-	-webkit-animation: wpview-loading 1.3s infinite 1s linear;
-	animation: wpview-loading 1.3s infinite 1s linear;
+	-webkit-animation: wpview-loading 1.3s infinite 1s steps(36);
+	animation: wpview-loading 1.3s infinite 1s steps(36);
 }
 
 @-webkit-keyframes wpview-loading {