diff --git a/include/libtorrent/alert_types.hpp b/include/libtorrent/alert_types.hpp
index 53f3f1b31..7deeb75cd 100644
--- a/include/libtorrent/alert_types.hpp
+++ b/include/libtorrent/alert_types.hpp
@@ -2215,8 +2215,8 @@ namespace libtorrent
 	{
 		// internal
 		dht_stats_alert(aux::stack_allocator& alloc
-			, std::vector<dht_routing_bucket> const& table
-			, std::vector<dht_lookup> const& requests);
+			, std::vector<dht_routing_bucket> table
+			, std::vector<dht_lookup> requests);
 
 		TORRENT_DEFINE_ALERT(dht_stats_alert, 83)
 
diff --git a/src/alert.cpp b/src/alert.cpp
index 368af8df9..5fdced139 100644
--- a/src/alert.cpp
+++ b/src/alert.cpp
@@ -1318,7 +1318,7 @@ namespace libtorrent {
 
 	state_update_alert::state_update_alert(aux::stack_allocator&
 		, std::vector<torrent_status> st)
-		: status(st)
+		: status(std::move(st))
 	{}
 
 	std::string state_update_alert::message() const
@@ -1672,11 +1672,11 @@ namespace libtorrent {
 	}
 
 	dht_stats_alert::dht_stats_alert(aux::stack_allocator&
-		, std::vector<dht_routing_bucket> const& table
-		, std::vector<dht_lookup> const& requests)
+		, std::vector<dht_routing_bucket> table
+		, std::vector<dht_lookup> requests)
 		: alert()
-		, active_requests(requests)
-		, routing_table(table)
+		, active_requests(std::move(requests))
+		, routing_table(std::move(table))
 	{}
 
 	std::string dht_stats_alert::message() const
@@ -1888,7 +1888,7 @@ namespace libtorrent {
 		std::vector<tcp::endpoint> p(peers());
 		v.reserve(p.size());
 		std::copy(p.begin(), p.end(), std::back_inserter(v));
-    }
+	}
 #endif
 	std::vector<tcp::endpoint> dht_get_peers_reply_alert::peers() const {
 		std::vector<tcp::endpoint> peers(m_num_peers);
diff --git a/src/session_impl.cpp b/src/session_impl.cpp
index 3ac928c60..74f1dc259 100644
--- a/src/session_impl.cpp
+++ b/src/session_impl.cpp
@@ -4523,7 +4523,7 @@ namespace aux {
 		m_posting_torrent_updates = false;
 #endif
 
-		m_alerts.emplace_alert<state_update_alert>(status);
+		m_alerts.emplace_alert<state_update_alert>(std::move(status));
 	}
 
 	void session_impl::post_session_stats()
@@ -4564,7 +4564,7 @@ namespace aux {
 			m_dht->dht_status(table, requests);
 #endif
 
-		m_alerts.emplace_alert<dht_stats_alert>(table, requests);
+		m_alerts.emplace_alert<dht_stats_alert>(std::move(table), std::move(requests));
 	}
 
 	std::vector<torrent_handle> session_impl::get_torrents() const