diff --git a/tests/test_many_random_payloads.cc b/tests/test_many_random_payloads.cc
index 9ee434c..d3c45c6 100644
--- a/tests/test_many_random_payloads.cc
+++ b/tests/test_many_random_payloads.cc
@@ -9,19 +9,27 @@
 #include <random>
 #include <thread>
 
+using std::atomic;
+using std::generate;
+using std::max;
+using std::mt19937;
+using std::none_of;
+using std::thread;
+using std::vector;
+
 auto constexpr LEN{ 4u * 1024u * 1024u };
 
 namespace {
-std::atomic<int> s_iterations{ 250u };
+atomic<int> s_iterations{ 250u };
 }
 
 TEST_CASE("many random payloads") {
   auto const thread_proc{ [](unsigned seed) {
-    std::mt19937 mt{ seed };  // deterministic
+    mt19937 mt{ seed };  // deterministic
     byte_vec_t src(LEN), dec(LEN), enc(COBS_ENCODE_MAX(LEN));
 
     while (--s_iterations > 0) {
-      std::generate(src.begin(), src.end(), [&]() { return byte_t(mt()); });
+      generate(src.begin(), src.end(), [&]() { return byte_t(mt()); });
       memset(src.data() + 1000, 0xAA, 256 * 10);  // nonzero run
 
       size_t enc_len{ 0u };
@@ -30,8 +38,7 @@ TEST_CASE("many random payloads") {
 
       REQUIRE(enc_len >= LEN);
       REQUIRE(enc_len <= COBS_ENCODE_MAX(LEN));
-      REQUIRE(
-          std::none_of(enc.data(), enc.data() + enc_len - 1, [](byte_t b) { return !b; }));
+      REQUIRE(none_of(enc.data(), enc.data() + enc_len - 1, [](byte_t b) { return !b; }));
       REQUIRE(enc[enc_len - 1] == 0);
 
       size_t dec_len{ 0u };
@@ -43,9 +50,8 @@ TEST_CASE("many random payloads") {
     }
   } };
 
-  std::vector<std::thread> threads;
-  for (auto i{ 0u }, n{ std::max(1u, std::thread::hardware_concurrency() - 1) }; i < n;
-       ++i) {
+  vector<thread> threads;
+  for (auto i{ 0u }, n{ max(1u, thread::hardware_concurrency() - 1) }; i < n; ++i) {
     threads.emplace_back(thread_proc, i);
   }