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--- a/include/bitcoin/bitcoin/wallet/dictionary.hpp
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+++ b/include/bitcoin/bitcoin/wallet/dictionary.hpp
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@@ -22,6 +22,7 @@
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#include <array>
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#include <vector>
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#include <bitcoin/bitcoin/compat.hpp>
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+#include <cstddef>
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namespace libbitcoin {
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namespace wallet {
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