diff --git a/admin/admin.php b/admin/admin.php
index a8ce907..2ad9cca 100644
--- a/admin/admin.php
+++ b/admin/admin.php
@@ -301,7 +301,7 @@ public static function _save_post( $post_id ) {
 		// Save data
 		if ( isset( $_POST['wps_subtitle'] ) ) {
 
-			$subtitle = new WP_Subtitle( $post );
+			$subtitle = new WP_Subtitle( $post_id );
 			$subtitle->update_subtitle( $_POST['wps_subtitle'] );
 
 		}