diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 3cb8643..290b8e5 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -6,8 +6,8 @@ if(HDR_HISTOGRAM_BUILD_BENCHMARK)
         include(ExternalProject)
 
         ExternalProject_Add(google_benchmark
-            URL ${PROJECT_SOURCE_DIR}/lib/benchmark-1.5.0.zip
-            URL_MD5 1af48846917b9730bee1848f6e38f563
+            URL ${PROJECT_SOURCE_DIR}/lib/benchmark-1.6.1.zip
+            URL_MD5 d061aaa421b628673cfbdd8b2b4a16a6
             CMAKE_ARGS -DBENCHMARK_ENABLE_TESTING=OFF -DBENCHMARK_ENABLE_INSTALL=OFF
             SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/googlebenchmark-src
             BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/googlebenchmark-build
diff --git a/test/hdr_histogram_benchmark.cpp b/test/hdr_histogram_benchmark.cpp
index 9689e02..eef2b97 100644
--- a/test/hdr_histogram_benchmark.cpp
+++ b/test/hdr_histogram_benchmark.cpp
@@ -1,6 +1,6 @@
 #include <benchmark/benchmark.h>
-#include <hdr_histogram.h>
-#include <math.h>
+#include <hdr/hdr_histogram.h>
+#include <cmath>
 #include <random>
 
 #ifdef _WIN32