diff --git a/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh b/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh
index 61a6046273..c5218549ad 100644
--- a/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh
+++ b/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh
@@ -45,7 +45,7 @@ struct check_index_layout {
                 "paste in the new size and consider updating the serialization logic");
 };
 
-template struct check_index_layout<sizeof(index<double, std::uint64_t>), 328>;
+template struct check_index_layout<sizeof(index<double, std::uint64_t>), 368>;
 
 /**
  * Save the index to file.