diff --git a/nano/slow_test/node.cpp b/nano/slow_test/node.cpp
index 3c86928f..4d6f9069 100644
--- a/nano/slow_test/node.cpp
+++ b/nano/slow_test/node.cpp
@@ -2096,7 +2096,7 @@ TEST (system, block_sequence)
 	size_t const pr_count = 4;
 	size_t const listeners_per_pr = 0;
 	nano::test::system system;
-	std::vector<nano::keypair> reps;
+	std::deque<nano::keypair> reps;
 	for (auto i = 0; i < pr_count; ++i)
 	{
 		reps.push_back (nano::keypair{});
diff --git a/nano/test_common/system.cpp b/nano/test_common/system.cpp
index f54eb400..29132fe6 100644
--- a/nano/test_common/system.cpp
+++ b/nano/test_common/system.cpp
@@ -206,7 +206,7 @@ void nano::test::system::stop_node (nano::node & node)
 	debug_assert (!ec);
 }
 
-void nano::test::system::ledger_initialization_set (std::vector<nano::keypair> const & reps, nano::amount const & reserve)
+void nano::test::system::ledger_initialization_set (std::deque<nano::keypair> const & reps, nano::amount const & reserve)
 {
 	nano::block_hash previous = nano::dev::genesis->hash ();
 	auto amount = (nano::dev::constants.genesis_amount - reserve.number ()) / reps.size ();
diff --git a/nano/test_common/system.hpp b/nano/test_common/system.hpp
index e174d719..8f08a47c 100644
--- a/nano/test_common/system.hpp
+++ b/nano/test_common/system.hpp
@@ -27,7 +27,7 @@ namespace test
 
 		void stop ();
 
-		void ledger_initialization_set (std::vector<nano::keypair> const & reps, nano::amount const & reserve = 0);
+		void ledger_initialization_set (std::deque<nano::keypair> const & reps, nano::amount const & reserve = 0);
 		void generate_activity (nano::node &, std::vector<nano::account> &);
 		void generate_mass_activity (uint32_t, nano::node &);
 		void generate_usage_traffic (uint32_t, uint32_t, size_t);
@@ -87,7 +87,7 @@ namespace test
 		std::chrono::time_point<std::chrono::steady_clock, std::chrono::duration<double>> deadline{ std::chrono::steady_clock::time_point::max () };
 		double deadline_scaling_factor{ 1.0 };
 		unsigned node_sequence{ 0 };
-		std::vector<std::shared_ptr<nano::block>> initialization_blocks;
+		std::deque<std::shared_ptr<nano::block>> initialization_blocks;
 	};
 
 	std::shared_ptr<nano::state_block> upgrade_epoch (nano::work_pool &, nano::ledger &, nano::epoch);