diff --git a/include/bitcoin/database/types/unspent_coin.hpp b/include/bitcoin/database/types/unspent_coin.hpp
index 2abd6b3d8..a431c24a5 100644
--- a/include/bitcoin/database/types/unspent_coin.hpp
+++ b/include/bitcoin/database/types/unspent_coin.hpp
@@ -50,6 +50,8 @@ struct BCD_API unspent_coin
     system::data_chunk script{};
 };
 
+using unspent_coins = std::vector<unspent_coin>;
+
 } // namespace database
 } // namespace libbitcoin