diff --git a/nano/core_test/message_parser.cpp b/nano/core_test/message_parser.cpp
index d81050e9..0bf62f22 100644
--- a/nano/core_test/message_parser.cpp
+++ b/nano/core_test/message_parser.cpp
@@ -67,8 +67,7 @@ TEST (message_parser, exact_confirm_ack_size)
 	nano::network_filter filter (1);
 	nano::block_uniquer block_uniquer;
 	nano::vote_uniquer vote_uniquer (block_uniquer);
-	nano::network_constants network;
-	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, network);
+	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, nano::dev::network_params.network);
 	auto block (std::make_shared<nano::send_block> (1, 1, 2, nano::keypair ().prv, 4, *system.work.generate (nano::root (1))));
 	auto vote (std::make_shared<nano::vote> (0, nano::keypair ().prv, 0, std::move (block)));
 	nano::confirm_ack message{ nano::dev::network_params.network, vote };
@@ -102,8 +101,7 @@ TEST (message_parser, exact_confirm_req_size)
 	nano::network_filter filter (1);
 	nano::block_uniquer block_uniquer;
 	nano::vote_uniquer vote_uniquer (block_uniquer);
-	nano::network_constants network;
-	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, network);
+	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, nano::dev::network_params.network);
 	auto block (std::make_shared<nano::send_block> (1, 1, 2, nano::keypair ().prv, 4, *system.work.generate (nano::root (1))));
 	nano::confirm_req message{ nano::dev::network_params.network, block };
 	std::vector<uint8_t> bytes;
@@ -136,8 +134,7 @@ TEST (message_parser, exact_confirm_req_hash_size)
 	nano::network_filter filter (1);
 	nano::block_uniquer block_uniquer;
 	nano::vote_uniquer vote_uniquer (block_uniquer);
-	nano::network_constants network;
-	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, network);
+	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, nano::dev::network_params.network);
 	nano::send_block block (1, 1, 2, nano::keypair ().prv, 4, *system.work.generate (nano::root (1)));
 	nano::confirm_req message{ nano::dev::network_params.network, block.hash (), block.root () };
 	std::vector<uint8_t> bytes;
@@ -170,8 +167,7 @@ TEST (message_parser, exact_publish_size)
 	nano::network_filter filter (1);
 	nano::block_uniquer block_uniquer;
 	nano::vote_uniquer vote_uniquer (block_uniquer);
-	nano::network_constants network;
-	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, network);
+	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, nano::dev::network_params.network);
 	auto block (std::make_shared<nano::send_block> (1, 1, 2, nano::keypair ().prv, 4, *system.work.generate (nano::root (1))));
 	nano::publish message{ nano::dev::network_params.network, block };
 	std::vector<uint8_t> bytes;
@@ -204,8 +200,7 @@ TEST (message_parser, exact_keepalive_size)
 	nano::network_filter filter (1);
 	nano::block_uniquer block_uniquer;
 	nano::vote_uniquer vote_uniquer (block_uniquer);
-	nano::network_constants network;
-	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, network);
+	nano::message_parser parser (filter, block_uniquer, vote_uniquer, visitor, system.work, nano::dev::network_params.network);
 	nano::keepalive message{ nano::dev::network_params.network };
 	std::vector<uint8_t> bytes;
 	{
diff --git a/nano/core_test/system.cpp b/nano/core_test/system.cpp
index 015a81dd..7ea6dd7d 100644
--- a/nano/core_test/system.cpp
+++ b/nano/core_test/system.cpp
@@ -10,9 +10,8 @@ TEST (system, work_generate_limited)
 {
 	nano::system system;
 	nano::block_hash key (1);
-	nano::network_constants constants;
-	auto min = constants.publish_thresholds.entry;
-	auto max = constants.publish_thresholds.base;
+	auto min = nano::dev::network_params.network.publish_thresholds.entry;
+	auto max = nano::dev::network_params.network.publish_thresholds.base;
 	for (int i = 0; i < 5; ++i)
 	{
 		auto work = system.work_generate_limited (key, min, max);
diff --git a/nano/core_test/work_pool.cpp b/nano/core_test/work_pool.cpp
index f2bc1450..c7f7ed22 100644
--- a/nano/core_test/work_pool.cpp
+++ b/nano/core_test/work_pool.cpp
@@ -16,7 +16,6 @@
 
 TEST (work, one)
 {
-	nano::network_constants network_constants;
 	nano::work_pool pool{ nano::dev::network_params.network, std::numeric_limits<unsigned>::max () };
 	nano::change_block block (1, 1, nano::keypair ().prv, 3, 4);
 	block.block_work_set (*pool.generate (block.root ()));
@@ -25,7 +24,6 @@ TEST (work, one)
 
 TEST (work, disabled)
 {
-	nano::network_constants network_constants;
 	nano::work_pool pool{ nano::dev::network_params.network, 0 };
 	auto result (pool.generate (nano::block_hash ()));
 	ASSERT_FALSE (result.is_initialized ());
@@ -33,7 +31,6 @@ TEST (work, disabled)
 
 TEST (work, validate)
 {
-	nano::network_constants network_constants;
 	nano::work_pool pool{ nano::dev::network_params.network, std::numeric_limits<unsigned>::max () };
 	nano::send_block send_block (1, 1, 2, nano::keypair ().prv, 4, 6);
 	ASSERT_LT (send_block.difficulty (), nano::work_threshold_base (send_block.work_version ()));
@@ -50,7 +47,7 @@ TEST (work, cancel)
 	{
 		nano::root key (1);
 		pool.generate (
-		nano::work_version::work_1, key, nano::network_constants ().publish_thresholds.base, [&done] (boost::optional<uint64_t> work_a) {
+		nano::work_version::work_1, key, nano::dev::network_params.network.publish_thresholds.base, [&done] (boost::optional<uint64_t> work_a) {
 			done = !work_a;
 		});
 		pool.cancel (key);
@@ -68,13 +65,12 @@ TEST (work, cancel_many)
 	nano::root key4 (1);
 	nano::root key5 (3);
 	nano::root key6 (1);
-	nano::network_constants constants;
-	pool.generate (nano::work_version::work_1, key1, constants.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
-	pool.generate (nano::work_version::work_1, key2, constants.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
-	pool.generate (nano::work_version::work_1, key3, constants.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
-	pool.generate (nano::work_version::work_1, key4, constants.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
-	pool.generate (nano::work_version::work_1, key5, constants.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
-	pool.generate (nano::work_version::work_1, key6, constants.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
+	pool.generate (nano::work_version::work_1, key1, nano::dev::network_params.network.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
+	pool.generate (nano::work_version::work_1, key2, nano::dev::network_params.network.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
+	pool.generate (nano::work_version::work_1, key3, nano::dev::network_params.network.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
+	pool.generate (nano::work_version::work_1, key4, nano::dev::network_params.network.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
+	pool.generate (nano::work_version::work_1, key5, nano::dev::network_params.network.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
+	pool.generate (nano::work_version::work_1, key6, nano::dev::network_params.network.publish_thresholds.base, [] (boost::optional<uint64_t>) {});
 	pool.cancel (key1);
 }