diff --git a/boards/models/post/sync.py b/boards/models/post/sync.py
--- a/boards/models/post/sync.py
+++ b/boards/models/post/sync.py
@@ -235,7 +235,7 @@ class SyncManager:
 
         models = et.SubElement(response, TAG_MODELS)
 
-        for post in Post.objects.all():
+        for post in Post.objects.prefetch_related('global_id').all():
             tag_id = et.SubElement(models, TAG_ID)
             post.global_id.to_xml_element(tag_id)