diff --git a/test/cpp/microbenchmarks/bm_fullstack.cc b/test/cpp/microbenchmarks/bm_fullstack.cc
index 696b453fa31..6cc780d44af 100644
--- a/test/cpp/microbenchmarks/bm_fullstack.cc
+++ b/test/cpp/microbenchmarks/bm_fullstack.cc
@@ -232,7 +232,7 @@ class InProcessCHTTP2 : public EndpointPairFixture {
  * CONTEXT MUTATORS
  */
 
-static const int kPregenerateKeyCount = 10000000;
+static const int kPregenerateKeyCount = 100000;
 
 template <class F>
 auto MakeVector(size_t length, F f) -> std::vector<decltype(f())> {