Index: wp-includes/css/admin-bar.dev.css
===================================================================
--- wp-includes/css/admin-bar.dev.css	(revision 19630)
+++ wp-includes/css/admin-bar.dev.css	(working copy)
@@ -27,6 +27,11 @@
 	background: none;
 }
 
+#wpadminbar a img.avatar-64 {
+	width: 64px;
+	height: 64px;
+}
+
 #wpadminbar {
 	direction: ltr;
 	color: #ccc;