diff --git a/test/cpp/microbenchmarks/helpers.h b/test/cpp/microbenchmarks/helpers.h
index 66bf976e3c1a192d6943887cd22ec4281f7668fa..7360a1c9f267deffeceb2581a67845a18a673f87 100644
--- a/test/cpp/microbenchmarks/helpers.h
+++ b/test/cpp/microbenchmarks/helpers.h
@@ -35,7 +35,6 @@
 #define TEST_CPP_MICROBENCHMARKS_COUNTERS_H
 
 #include <sstream>
-#include <string>
 
 extern "C" {
 #include <grpc/support/port_platform.h>