diff --git a/src/bundle/Core/Resources/config/storage/legacy/schema.yaml b/src/bundle/Core/Resources/config/storage/legacy/schema.yaml
index 68353ee052..7791494fd7 100644
--- a/src/bundle/Core/Resources/config/storage/legacy/schema.yaml
+++ b/src/bundle/Core/Resources/config/storage/legacy/schema.yaml
@@ -315,9 +315,10 @@ tables:
     ibexa_content_version:
         indexes:
             ibexa_content_version_status: { fields: [status] }
-            ibexa_content_version_idx_ver: { fields: [contentobject_id, version] }
             ibexa_content_version_idx_status: { fields: [contentobject_id, status] }
             ibexa_content_version_creator_id: { fields: [creator_id] }
+        uniqueConstraints:
+            ibexa_content_version_idx_ver: { fields: [contentobject_id, version] }
         id:
             id: { type: integer, nullable: false, options: { autoincrement: true } }
         fields: