diff --git a/app/models/task.rb b/app/models/task.rb
index 6a10c556..952c6fcf 100644
--- a/app/models/task.rb
+++ b/app/models/task.rb
@@ -45,7 +45,7 @@ def sync_with_github
       end
 
       Task.transaction do
-        Task.where(github_id: deleted_ids).destroy_all if deleted_ids.any?
+        Task.where(github_id: deleted_ids).where.not(status: "done").destroy_all if deleted_ids.any?
 
         if tasks.any?
           task_ids_by_github_id = Task.upsert_all(tasks, returning: [:github_id, :id], unique_by: [:github_id]).rows.to_h