diff --git a/src/arraysize.h b/src/arraysize.h
index 3a7c0c78..638a52a0 100644
--- a/src/arraysize.h
+++ b/src/arraysize.h
@@ -1,8 +1,6 @@
 #ifndef BENCHMARK_ARRAYSIZE_H_
 #define BENCHMARK_ARRAYSIZE_H_
 
-#include <cstddef>
-
 #include "internal_macros.h"
 
 namespace benchmark {
diff --git a/test/basic_test.cc b/test/basic_test.cc
index e3d114ad..34354154 100644
--- a/test/basic_test.cc
+++ b/test/basic_test.cc
@@ -1,6 +1,4 @@
 
-#include <cstddef>
-
 #include "benchmark/benchmark_api.h"
 
 #define BASIC_BENCHMARK_TEST(x) \