diff --git a/src/wp-admin/includes/class-wp-site-icon.php b/src/wp-admin/includes/class-wp-site-icon.php
index d14ead34cd7a7..ea0ab35007327 100644
--- a/src/wp-admin/includes/class-wp-site-icon.php
+++ b/src/wp-admin/includes/class-wp-site-icon.php
@@ -60,6 +60,9 @@ class WP_Site_Icon {
 		 */
 		180,
 
+		// High-density (2x) site icon for the admin bar and post embeds.
+		64,
+
 		// Our regular Favicon.
 		32,
 	);