diff --git a/benchmark/bench_actor.cpp b/benchmark/bench_actor.cpp
index 674ca33e3..846dc9f39 100644
--- a/benchmark/bench_actor.cpp
+++ b/benchmark/bench_actor.cpp
@@ -10,6 +10,7 @@
 #include "td/actor/PromiseFuture.h"
 
 #include "td/utils/common.h"
+#include "td/utils/crypto.h"
 #include "td/utils/logging.h"
 
 #if TD_MSVC
@@ -266,6 +267,8 @@ class QueryBench : public td::Benchmark {
 };
 
 int main() {
+  td::init_openssl_threads();
+
   SET_VERBOSITY_LEVEL(VERBOSITY_NAME(DEBUG));
   bench(RingBench<4>(504, 0));
   bench(RingBench<3>(504, 0));
@@ -285,5 +288,4 @@ int main() {
   bench(RingBench<0>(504, 2));
   bench(RingBench<1>(504, 2));
   bench(RingBench<2>(504, 2));
-  return 0;
 }
diff --git a/benchmark/bench_crypto.cpp b/benchmark/bench_crypto.cpp
index a4482f59b..c7d34adb4 100644
--- a/benchmark/bench_crypto.cpp
+++ b/benchmark/bench_crypto.cpp
@@ -366,5 +366,4 @@ int main() {
   td::bench(SHA1Bench());
   td::bench(Crc32Bench());
   td::bench(Crc64Bench());
-  return 0;
 }
diff --git a/benchmark/bench_db.cpp b/benchmark/bench_db.cpp
index aee56f610..bdc3bad81 100644
--- a/benchmark/bench_db.cpp
+++ b/benchmark/bench_db.cpp
@@ -238,5 +238,4 @@ int main() {
   bench(TdKvBench<td::BinlogKeyValue<td::Binlog>>("BinlogKeyValue<Binlog>"));
   bench(TdKvBench<td::BinlogKeyValue<td::ConcurrentBinlog>>("BinlogKeyValue<ConcurrentBinlog>"));
   bench(SeqKvBench());
-  return 0;
 }
diff --git a/benchmark/bench_handshake.cpp b/benchmark/bench_handshake.cpp
index 376175ffa..23ca5c647 100644
--- a/benchmark/bench_handshake.cpp
+++ b/benchmark/bench_handshake.cpp
@@ -74,5 +74,4 @@ class HandshakeBench : public Benchmark {
 int main() {
   SET_VERBOSITY_LEVEL(VERBOSITY_NAME(DEBUG));
   td::bench(td::HandshakeBench());
-  return 0;
 }
diff --git a/benchmark/bench_log.cpp b/benchmark/bench_log.cpp
index 63807b2fd..0f778e753 100644
--- a/benchmark/bench_log.cpp
+++ b/benchmark/bench_log.cpp
@@ -160,5 +160,4 @@ int main() {
 #endif
   td::bench(IostreamWriteBench());
   td::bench(FILEWriteBench());
-  return 0;
 }
diff --git a/benchmark/bench_misc.cpp b/benchmark/bench_misc.cpp
index 84c4465c2..f87d2af3d 100644
--- a/benchmark/bench_misc.cpp
+++ b/benchmark/bench_misc.cpp
@@ -391,5 +391,4 @@ int main() {
 #if TD_LINUX || TD_ANDROID || TD_TIZEN
   td::bench(td::SemBench());
 #endif
-  return 0;
 }
diff --git a/benchmark/bench_queue.cpp b/benchmark/bench_queue.cpp
index 75241894a..f8dedbe72 100644
--- a/benchmark/bench_queue.cpp
+++ b/benchmark/bench_queue.cpp
@@ -974,6 +974,4 @@ int main() {
   // BENCH_Q(BufferQueue, 100);
   // BENCH_Q(BufferQueue, 10);
   // BENCH_Q(BufferQueue, 1);
-
-  return 0;
 }
diff --git a/benchmark/bench_tddb.cpp b/benchmark/bench_tddb.cpp
index 26f358c70..05628792f 100644
--- a/benchmark/bench_tddb.cpp
+++ b/benchmark/bench_tddb.cpp
@@ -112,5 +112,4 @@ class MessagesDbBench : public Benchmark {
 int main() {
   SET_VERBOSITY_LEVEL(VERBOSITY_NAME(WARNING));
   bench(td::MessagesDbBench());
-  return 0;
 }
diff --git a/benchmark/rmdir.cpp b/benchmark/rmdir.cpp
index 2b30b1eea..0c573e326 100644
--- a/benchmark/rmdir.cpp
+++ b/benchmark/rmdir.cpp
@@ -26,5 +26,4 @@ int main(int argc, char *argv[]) {
     //}
   });
   LOG(INFO) << status << ": " << cnt;
-  return 0;
 }
diff --git a/benchmark/wget.cpp b/benchmark/wget.cpp
index 4bd4e9dcb..7aa596d10 100644
--- a/benchmark/wget.cpp
+++ b/benchmark/wget.cpp
@@ -40,5 +40,4 @@ int main(int argc, char *argv[]) {
     // empty
   }
   scheduler->finish();
-  return 0;
 }