Index: wp-content/themes/twentythirteen/style.css
===================================================================
--- wp-content/themes/twentythirteen/style.css	(revision 23470)
+++ wp-content/themes/twentythirteen/style.css	(working copy)
@@ -2613,7 +2613,8 @@
 	margin-right: 0;
 }
 
-.site-footer .widget h3 {
+.site-footer .widget-title,
+.site-footer .widget-title a {
 	color: #fff;
 }