Index: wp-content/themes/twentythirteen/style.css
===================================================================
--- wp-content/themes/twentythirteen/style.css	(revision 23964)
+++ wp-content/themes/twentythirteen/style.css	(working copy)
@@ -500,6 +500,7 @@
 .bypostauthor .fn:before,
 .error404 .page-title:before {
 	-webkit-font-smoothing: antialiased;
+	display: inline-block;
 	font: normal 16px/1 Genericons;
 	vertical-align: text-bottom;
 }