diff --git a/wp-includes/user.php b/wp-includes/user.php
index 8ba06e850..692dbce27 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -416,7 +416,7 @@ class WP_User_Query {
 				FROM wp_posts
 				$where
 				GROUP BY post_author
-			) p ON (wp_users.ID = p.post_author)
+			) p ON ({$wpdb->users}.ID = p.post_author)
 			";
 			$orderby = 'post_count';
 		}