diff --git a/core/css/guest.css b/core/css/guest.css
index f6700315b74..626fb67718b 100644
--- a/core/css/guest.css
+++ b/core/css/guest.css
@@ -631,6 +631,9 @@ p.info {
 	margin: 10px;
 	background-size: 32px;
 }
+#update-progress-icon.icon-error-white {
+	background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewbox="0 0 16 16" width="16" height="16"><path d="M5.516 2L2 5.516v4.968L5.516 14h4.968L14 10.484V5.516L10.484 2H5.516zM7 4h2v5H7V4zm0 6h2v2H7v-2z" fill="%23fff"/></svg>');
+}
 
 /* Icons */
 .icon-info-white {