diff --git a/include/ircd/net/dns.h b/include/ircd/net/dns.h
index 5cea611e1..c1de88359 100644
--- a/include/ircd/net/dns.h
+++ b/include/ircd/net/dns.h
@@ -35,7 +35,7 @@ struct ircd::net::dns
 	struct resolver static *resolver;
 	struct opts static const opts_default;
 
-	using callback = std::function<void (std::exception_ptr, const hostport &, vector_view<const rfc1035::record *>)>;
+	using callback = std::function<void (std::exception_ptr, const hostport &, const vector_view<const rfc1035::record *> &)>;
 	using callback_A_one = std::function<void (std::exception_ptr, const hostport &, const rfc1035::record::A &)>;
 	using callback_SRV_one = std::function<void (std::exception_ptr, const hostport &, const rfc1035::record::SRV &)>;
 	using callback_ipport_one = std::function<void (std::exception_ptr, const hostport &, const ipport &)>;
diff --git a/include/ircd/net/resolver.h b/include/ircd/net/resolver.h
index f059655cb..4debe0d8c 100644
--- a/include/ircd/net/resolver.h
+++ b/include/ircd/net/resolver.h
@@ -54,7 +54,7 @@ struct ircd::net::dns::resolver
 
 	template<class... A> tag &set_tag(A&&...);
 	const_buffer make_query(const mutable_buffer &buf, const tag &) const;
-	void operator()(const hostport &, const opts &, callback);
+	void operator()(const hostport &, const opts &, callback &&);
 
 	bool check_timeout(const uint16_t &id, tag &, const steady_point &expired);
 	void check_timeouts(const milliseconds &timeout);
diff --git a/ircd/net.cc b/ircd/net.cc
index 685c1e920..2fd1f62a7 100644
--- a/ircd/net.cc
+++ b/ircd/net.cc
@@ -2476,7 +2476,7 @@ ircd::net::dns::operator()(const hostport &hp,
 {
 	assert(bool(ircd::net::dns::resolver));
 	operator()(hp, opts, [callback(std::move(callback))]
-	(std::exception_ptr eptr, const hostport &hp, const vector_view<const rfc1035::record *> rrs)
+	(std::exception_ptr eptr, const hostport &hp, const vector_view<const rfc1035::record *> &rrs)
 	{
 		static const rfc1035::record::A empty;
 
@@ -2963,7 +2963,7 @@ ircd::net::dns::resolver::check_timeout(const uint16_t &id,
 void
 ircd::net::dns::resolver::operator()(const hostport &hp,
                                      const opts &opts,
-                                     callback callback)
+                                     callback &&callback)
 {
 	auto &tag
 	{