diff --git a/libraries/chain/db_block.cpp b/libraries/chain/db_block.cpp
index 9014300e..518fccd0 100644
--- a/libraries/chain/db_block.cpp
+++ b/libraries/chain/db_block.cpp
@@ -79,10 +79,11 @@ const signed_transaction& database::get_recent_transaction(const transaction_id_
 std::vector<block_id_type> database::get_block_ids_on_fork(block_id_type head_of_fork) const
 {
   pair<fork_database::branch_type, fork_database::branch_type> branches = _fork_db.fetch_branch_from(head_block_id(), head_of_fork);
-  assert(branches.first.back()->id == branches.second.back()->id);
+  assert(branches.first.back()->previous_id() == branches.second.back()->previous_id());
   std::vector<block_id_type> result;
   for (const item_ptr& fork_block : branches.second)
     result.emplace_back(fork_block->id);
+  result.emplace_back(branches.first.back()->previous_id());
   return result;
 }