diff --git a/cpp/src/db/DBImpl.cpp b/cpp/src/db/DBImpl.cpp
index a05d6001f243a093285ad4cc4cb0d01714ed2b83..b932a0ad36d7d4679b690dc4de64b91876a9d88c 100644
--- a/cpp/src/db/DBImpl.cpp
+++ b/cpp/src/db/DBImpl.cpp
@@ -96,7 +96,6 @@ Status DBImpl::search(const std::string &group_id, size_t k, size_t nq,
         index->add_with_ids(file_index->ntotal,
                             dynamic_cast<faiss::IndexFlat *>(file_index->index)->xb.data(),
                             file_index->id_map.data());
-        delete file_index;
     }
 
     {