diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5314caa7d0c..696cb5c4fe3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 - `craft\helpers\Json::encode()` no longer sets the `JSON_UNESCAPED_SLASHES` flag by default.
 - Fixed a JavaScript error that occurred when resolving an asset move conflict. ([#12920](https://github.com/craftcms/cms/issues/12920))
 - Fixed a bug where volume subfolders were being shown when viewing soft-deleted assets. ([#12927](https://github.com/craftcms/cms/issues/12927))
+- Fixed a bug where structure data was getting deleted when running garbage collection on PostgreSQL. ([#12925](https://github.com/craftcms/cms/issues/12925))
 
 ## 3.8.3 - 2023-03-16
 
diff --git a/src/services/Gc.php b/src/services/Gc.php
index 424016c29aa..f8ed1f0bfec 100644
--- a/src/services/Gc.php
+++ b/src/services/Gc.php
@@ -390,7 +390,8 @@ private function _deleteOrphanedStructureElements(): void
 DELETE FROM $structureElementsTable
 USING $structureElementsTable [[se]]
 LEFT JOIN $elementsTable [[e]] ON [[e.id]] = [[se.elementId]]
-WHERE [[se.elementId]] IS NOT NULL AND [[e.id]] IS NULL
+WHERE $structureElementsTable.[[id]] = [[se.id]] AND
+  [[se.elementId]] IS NOT NULL AND [[e.id]] IS NULL
 SQL;
         }