diff --git a/tests/benchmark.cc b/tests/benchmark.cc
index 3d9a72a7ec..84034768ad 100644
--- a/tests/benchmark.cc
+++ b/tests/benchmark.cc
@@ -72,10 +72,10 @@ static void BM_LoadDescriptor_Proto2(benchmark::State& state) {
 }
 BENCHMARK(BM_LoadDescriptor_Proto2);
 
-static void BM_ParseDescriptor_Upb_LargeInitialBlock(benchmark::State& state) {
+static void BM_ParseDescriptor_Upb(benchmark::State& state) {
   size_t bytes = 0;
   for (auto _ : state) {
-    upb_arena* arena = upb_arena_init(buf, sizeof(buf), NULL);
+    upb_arena* arena = upb_arena_new();
     upb_benchmark_FileDescriptorProto* set =
         upb_benchmark_FileDescriptorProto_parse(descriptor.data,
                                                 descriptor.size, arena);
@@ -88,12 +88,12 @@ static void BM_ParseDescriptor_Upb_LargeInitialBlock(benchmark::State& state) {
   }
   state.SetBytesProcessed(state.iterations() * descriptor.size);
 }
-BENCHMARK(BM_ParseDescriptor_Upb_LargeInitialBlock);
+BENCHMARK(BM_ParseDescriptor_Upb);
 
-static void BM_ParseDescriptor_Upb(benchmark::State& state) {
+static void BM_ParseDescriptor_Upb_LargeInitialBlock(benchmark::State& state) {
   size_t bytes = 0;
   for (auto _ : state) {
-    upb_arena* arena = upb_arena_new();
+    upb_arena* arena = upb_arena_init(buf, sizeof(buf), NULL);
     upb_benchmark_FileDescriptorProto* set =
         upb_benchmark_FileDescriptorProto_parse(descriptor.data,
                                                 descriptor.size, arena);
@@ -106,7 +106,7 @@ static void BM_ParseDescriptor_Upb(benchmark::State& state) {
   }
   state.SetBytesProcessed(state.iterations() * descriptor.size);
 }
-BENCHMARK(BM_ParseDescriptor_Upb);
+BENCHMARK(BM_ParseDescriptor_Upb_LargeInitialBlock);
 
 static void BM_ParseDescriptor_Proto2_NoArena(benchmark::State& state) {
   size_t bytes = 0;