diff --git a/src/wp-admin/css/edit.css b/src/wp-admin/css/edit.css
index 952ca2aff5..a6efcf02ad 100644
--- a/src/wp-admin/css/edit.css
+++ b/src/wp-admin/css/edit.css
@@ -308,7 +308,6 @@ ul.wp-tab-bar li {
 #postimagediv .inside img {
 	max-width: 100%;
 	height: auto;
-	width: auto;
 	vertical-align: top;
 	background-image: linear-gradient(45deg, #c3c4c7 25%, transparent 25%, transparent 75%, #c3c4c7 75%, #c3c4c7), linear-gradient(45deg, #c3c4c7 25%, transparent 25%, transparent 75%, #c3c4c7 75%, #c3c4c7);
 	background-position: 0 0, 10px 10px;