diff --git a/tile/base/chrono_test.cc b/tile/base/chrono_test.cc
index 8df941c..524fbce 100644
--- a/tile/base/chrono_test.cc
+++ b/tile/base/chrono_test.cc
@@ -5,8 +5,9 @@
 namespace tile {
 
 static constexpr auto one_ms = std::chrono::milliseconds(1);
+static constexpr auto kTestN = 1000;
 
-long AvageTime(std::function<long()> f, std::size_t n = 100) {
+long AvageTime(std::function<long()> f, std::size_t n = kTestN) {
   long double total = 0;
   for (std::size_t i = 0; i != n; ++i) {
     total += 1.0f / n * f();
@@ -34,7 +35,7 @@ TEST(CoarseSystemClock, Compare) {
     return (ReadCoarseSystemClock() - std::chrono::system_clock::now()) /
            one_ms;
   });
-  ASSERT_NEAR(diff, 0, 50);
+  ASSERT_NEAR(diff, 0, kTestN);
 }
 
 TEST(CoarseSteadyClock, Compare) {
@@ -42,6 +43,6 @@ TEST(CoarseSteadyClock, Compare) {
     return (ReadCoarseSteadyClock() - std::chrono::steady_clock::now()) /
            one_ms;
   });
-  ASSERT_NEAR(diff, 0, 50);
+  ASSERT_NEAR(diff, 0, kTestN);
 }
 } // namespace tile