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
@@ -235,8 +235,8 @@ class SyncManager:
                 opening_post = None
                 tag_tags = tag_content.find(TAG_TAGS)
                 for tag_tag in tag_tags:
-                    tag, created = Tag.objects.get_or_create(
-                        aliases__name=tag_tag.text)
+                    tag, created = Tag.objects.get_or_create_with_alias(
+                        name=tag_tag.text)
                     tags.append(tag)
 
             # TODO Check that the replied posts are already present
diff --git a/boards/tests/test_sync.py b/boards/tests/test_sync.py
--- a/boards/tests/test_sync.py
+++ b/boards/tests/test_sync.py
@@ -100,6 +100,7 @@ class SyncTest(TestCase):
                 post.get_sync_text(),
                 post.get_thread().get_tags().first().get_name(),
                 post.get_pub_time_str(),
+                post.last_edit_time,
             ) in response,
             'Wrong response generated for the GET request.')