diff --git a/src/wp-admin/includes/comment.php b/src/wp-admin/includes/comment.php
index 1620755b68..2ec9d6dc84 100644
--- a/src/wp-admin/includes/comment.php
+++ b/src/wp-admin/includes/comment.php
@@ -148,7 +148,7 @@ function get_pending_comments_num( $post_id ) {
  */
 function floated_admin_avatar( $name ) {
 	global $comment;
-	$avatar = get_avatar( $comment, 32 );
+	$avatar = get_avatar( $comment, 32, 'mystery' );
 	return "$avatar $name";
 }
 
diff --git a/src/wp-admin/includes/dashboard.php b/src/wp-admin/includes/dashboard.php
index 657402f942..c2ebaf9644 100644
--- a/src/wp-admin/includes/dashboard.php
+++ b/src/wp-admin/includes/dashboard.php
@@ -710,7 +710,7 @@ function _wp_dashboard_recent_comments_row( &$comment, $show_date = true ) {
 		<div id="comment-<?php echo $comment->comment_ID; ?>" <?php comment_class( array( 'comment-item', wp_get_comment_status($comment->comment_ID) ) ); ?>>
 			<?php if ( !$comment->comment_type || 'comment' == $comment->comment_type ) : ?>
 
-			<?php echo get_avatar( $comment, 50 ); ?>
+			<?php echo get_avatar( $comment, 50, 'mystery' ); ?>
 
 			<div class="dashboard-comment-wrap">
 			<h4 class="comment-meta">