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;
 }
Index: wp-content/themes/twentythirteen/rtl.css
===================================================================
--- wp-content/themes/twentythirteen/rtl.css	(revision 23964)
+++ wp-content/themes/twentythirteen/rtl.css	(working copy)
@@ -76,7 +76,7 @@
 
 
 /**
- * 2.0 Repeatable patterns
+ * 2.0 Repeatable patterns 
  * ----------------------------------------------------------------------------
  */
 
@@ -99,6 +99,7 @@
 .bypostauthor .fn:after,
 .error404 .page-title:after {
 	-webkit-font-smoothing: antialiased;
+	display: inline-block;
 	font: normal 16px/1 Genericons;
 	vertical-align: text-bottom;
 }