diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index f1462e4..58f7c45 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -788,9 +788,9 @@ ConflictSet &ConflictSet::operator=(ConflictSet &&other) noexcept {
 int main(void) {
   int64_t writeVersion = 0;
   ConflictSet::Impl cs{writeVersion};
-  constexpr int kNumKeys = 5;
-  ConflictSet::WriteRange write[kNumKeys];
   Arena arena;
+  constexpr int kNumKeys = 100;
+  auto *write = new (arena) ConflictSet::WriteRange[kNumKeys];
   for (int i = 0; i < kNumKeys; ++i) {
     write[i].begin = toKey(arena, i);
     write[i].end.len = 0;