diff --git a/include/bitcoin/bitcoin/wallet/dictionary.hpp b/include/bitcoin/bitcoin/wallet/dictionary.hpp index 632f1afc..63a51764 100644 --- a/include/bitcoin/bitcoin/wallet/dictionary.hpp +++ b/include/bitcoin/bitcoin/wallet/dictionary.hpp @@ -19,6 +19,7 @@ #ifndef LIBBITCOIN_WALLET_DICTIONARY_HPP #define LIBBITCOIN_WALLET_DICTIONARY_HPP +#include <cstddef> #include <array> #include <vector> #include <bitcoin/bitcoin/compat.hpp>