diff --git a/src/monero_send_routine.cpp b/src/monero_send_routine.cpp
index 77a565d..3b1ac3b 100644
--- a/src/monero_send_routine.cpp
+++ b/src/monero_send_routine.cpp
@@ -42,7 +42,6 @@
 #include "monero_key_image_utils.hpp"
 #include "monero_address_utils.hpp"
 //
-using namespace std;
 using namespace crypto;
 using namespace std;
 using namespace boost;
diff --git a/src/monero_send_routine.hpp b/src/monero_send_routine.hpp
index b7f7522..3dc6a4c 100644
--- a/src/monero_send_routine.hpp
+++ b/src/monero_send_routine.hpp
@@ -177,21 +177,21 @@ namespace monero_send_routine
 	// - Routine entrypoint
 	struct Async_SendFunds_Args
 	{ // TODO: add a way to pass native structures if available
-		const string &from_address_string;
-		const string &sec_viewKey_string;
-		const string &sec_spendKey_string;
-		const string &pub_spendKey_string;
-		const string &to_address_string;
+		string from_address_string;
+		string sec_viewKey_string;
+		string sec_spendKey_string;
+		string pub_spendKey_string;
+		string to_address_string;
 		optional<string> payment_id_string;
 		uint64_t sending_amount;
 		bool is_sweeping;
 		uint32_t simple_priority;
-		const send__get_unspent_outs_fn_type &get_unspent_outs_fn;
-		const send__get_random_outs_fn_type &get_random_outs_fn;
-		const send__submit_raw_tx_fn_type &submit_raw_tx_fn;
-		const send__status_update_fn_type &status_update_fn;
-		const send__error_cb_fn_type &error_cb_fn;
-		const send__success_cb_fn_type &success_cb_fn;
+		send__get_unspent_outs_fn_type get_unspent_outs_fn;
+		send__get_random_outs_fn_type get_random_outs_fn;
+		send__submit_raw_tx_fn_type submit_raw_tx_fn;
+		send__status_update_fn_type status_update_fn;
+		send__error_cb_fn_type error_cb_fn;
+		send__success_cb_fn_type success_cb_fn;
 		//
 		optional<uint64_t> unlock_time; // default 0
 		optional<cryptonote::network_type> nettype;