diff --git a/data/migrations/versions/228d1af6af1c_mysql_max_index_lengths.py b/data/migrations/versions/228d1af6af1c_mysql_max_index_lengths.py
index 0b70acbb3..2f6ff722b 100644
--- a/data/migrations/versions/228d1af6af1c_mysql_max_index_lengths.py
+++ b/data/migrations/versions/228d1af6af1c_mysql_max_index_lengths.py
@@ -18,5 +18,8 @@ def upgrade(tables):
   op.drop_index('queueitem_queue_name', table_name='queueitem')
   op.create_index('queueitem_queue_name', 'queueitem', ['queue_name'], unique=False, mysql_length=767)
 
+  op.drop_index('image_ancestors', table_name='image')
+  op.create_index('image_ancestors', 'image', ['ancestors'], unique=False, mysql_length=767)
+
 def downgrade(tables):
   pass