diff --git a/nano/secure/pending_info.cpp b/nano/secure/pending_info.cpp
index 24aa14b3ad..637f4adf74 100644
--- a/nano/secure/pending_info.cpp
+++ b/nano/secure/pending_info.cpp
@@ -65,3 +65,8 @@ nano::account const & nano::pending_key::key () const
 {
 	return account;
 }
+
+bool nano::pending_key::operator< (nano::pending_key const & other_a) const
+{
+	return account == other_a.account ? hash < other_a.hash : account < other_a.account;
+}
diff --git a/nano/secure/pending_info.hpp b/nano/secure/pending_info.hpp
index 4e69460399..584337e95e 100644
--- a/nano/secure/pending_info.hpp
+++ b/nano/secure/pending_info.hpp
@@ -28,8 +28,21 @@ class pending_key final
 	pending_key (nano::account const &, nano::block_hash const &);
 	bool deserialize (nano::stream &);
 	bool operator== (nano::pending_key const &) const;
+	bool operator< (nano::pending_key const &) const;
 	nano::account const & key () const;
 	nano::account account{};
 	nano::block_hash hash{ 0 };
 };
 } // namespace nano
+
+namespace std
+{
+template <>
+struct hash<::nano::pending_key>
+{
+	size_t operator() (::nano::pending_key const & data_a) const
+	{
+		return hash<::nano::uint512_union>{}({ ::nano::uint256_union{ data_a.account.number () }, data_a.hash });
+	}
+};
+}