diff --git a/src/wp-admin/includes/ajax-actions.php b/src/wp-admin/includes/ajax-actions.php
index a9e16af633..759f011b09 100644
--- a/src/wp-admin/includes/ajax-actions.php
+++ b/src/wp-admin/includes/ajax-actions.php
@@ -162,7 +162,7 @@ function wp_ajax_ajax_tag_search() {
 		)
 	);
 
-	echo join( $results, "\n" );
+	echo join( "\n", $results );
 	wp_die();
 }
 
diff --git a/src/wp-admin/includes/upgrade.php b/src/wp-admin/includes/upgrade.php
index 9ebe82ed47..30abdd46ce 100644
--- a/src/wp-admin/includes/upgrade.php
+++ b/src/wp-admin/includes/upgrade.php
@@ -1056,7 +1056,7 @@ function upgrade_130() {
 			$limit    = $option->dupes - 1;
 			$dupe_ids = $wpdb->get_col( $wpdb->prepare( "SELECT option_id FROM $wpdb->options WHERE option_name = %s LIMIT %d", $option->option_name, $limit ) );
 			if ( $dupe_ids ) {
-				$dupe_ids = join( $dupe_ids, ',' );
+				$dupe_ids = join( ',', $dupe_ids );
 				$wpdb->query( "DELETE FROM $wpdb->options WHERE option_id IN ($dupe_ids)" );
 			}
 		}