diff --git a/benchmark/bench_log.cpp b/benchmark/bench_log.cpp
index fa42828d8..35d25d9dc 100644
--- a/benchmark/bench_log.cpp
+++ b/benchmark/bench_log.cpp
@@ -11,7 +11,6 @@
 #include <cstdio>
 #include <fstream>
 #include <iostream>
-#include <mutex>
 #include <ostream>
 #include <streambuf>
 #include <string>
@@ -151,8 +150,6 @@ class LogWriteBench final : public td::Benchmark {
   }
 };
 
-std::mutex mutex;
-
 int main() {
   td::bench(LogWriteBench());
 #if TD_ANDROID