diff --git a/static/dbstructure.config.php b/static/dbstructure.config.php
index d1da024126..2905501747 100644
--- a/static/dbstructure.config.php
+++ b/static/dbstructure.config.php
@@ -54,7 +54,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1374);
+	define('DB_UPDATE_VERSION', 1375);
 }
 
 return [
diff --git a/update.php b/update.php
index 37cccd768d..460fad885c 100644
--- a/update.php
+++ b/update.php
@@ -749,3 +749,12 @@ function pre_update_1365()
 
 	return Update::SUCCESS;
 }
+
+function update_1375()
+{
+	if (!DBA::e("UPDATE `item` SET `thr-parent` = `parent-uri`, `thr-parent-id` = `parent-uri-id` WHERE `thr-parent` = ''")) {
+		return Update::FAILED;
+	}
+
+	return Update::SUCCESS;
+}