diff --git a/src/DNSCache.h b/src/DNSCache.h
index 501b6fd1..87666c47 100644
--- a/src/DNSCache.h
+++ b/src/DNSCache.h
@@ -115,7 +115,7 @@ public:
   void findAll(OutputIterator out, const std::string& hostname,
                uint16_t port) const
   {
-    std::shared_ptr<CacheEntry> target(new CacheEntry(hostname, port));
+    auto target = std::make_shared<CacheEntry>(hostname, port);
     auto i = entries_.find(target);
     if (i != entries_.end()) {
       (*i)->getAllGoodAddrs(out);
diff --git a/src/HttpRequestConnectChain.h b/src/HttpRequestConnectChain.h
index 0a5cc9d9..dd3ccaac 100644
--- a/src/HttpRequestConnectChain.h
+++ b/src/HttpRequestConnectChain.h
@@ -49,13 +49,11 @@ struct HttpRequestConnectChain : public ControlChain<ConnectCommand*> {
   virtual ~HttpRequestConnectChain() {}
   virtual int run(ConnectCommand* t, DownloadEngine* e) CXX11_OVERRIDE
   {
-    std::shared_ptr<SocketRecvBuffer> socketRecvBuffer(
-        new SocketRecvBuffer(t->getSocket()));
-    std::shared_ptr<HttpConnection> httpConnection(
-        new HttpConnection(t->getCuid(), t->getSocket(), socketRecvBuffer));
+    auto b = std::make_shared<SocketRecvBuffer>(t->getSocket());
+    auto k = std::make_shared<HttpConnection>(t->getCuid(), t->getSocket(), b);
     auto c = make_unique<HttpRequestCommand>(
         t->getCuid(), t->getRequest(), t->getFileEntry(), t->getRequestGroup(),
-        httpConnection, e, t->getSocket());
+        k, e, t->getSocket());
     c->setProxyRequest(t->getProxyRequest());
     c->setStatus(Command::STATUS_ONESHOT_REALTIME);
     e->setNoWait(true);
diff --git a/src/PortEventPoll.cc b/src/PortEventPoll.cc
index e2b13832..ecd7fbfa 100644
--- a/src/PortEventPoll.cc
+++ b/src/PortEventPoll.cc
@@ -168,7 +168,7 @@ int translateEvents(EventPoll::EventType events)
 
 bool PortEventPoll::addEvents(sock_t socket, const PortEventPoll::KEvent& event)
 {
-  std::shared_ptr<KSocketEntry> socketEntry(new KSocketEntry(socket));
+  auto socketEntry = std::make_shared<KSocketEntry>(socket);
   KSocketEntrySet::iterator i = socketEntries_.lower_bound(socketEntry);
   int r = 0;
   int errNum = 0;
@@ -220,7 +220,7 @@ bool PortEventPoll::addEvents(sock_t socket, Command* command, int events,
 bool PortEventPoll::deleteEvents(sock_t socket,
                                  const PortEventPoll::KEvent& event)
 {
-  std::shared_ptr<KSocketEntry> socketEntry(new KSocketEntry(socket));
+  auto socketEntry = std::make_shared<KSocketEntry>(socket);
   KSocketEntrySet::iterator i = socketEntries_.find(socketEntry);
   if (i == socketEntries_.end()) {
     A2_LOG_DEBUG(fmt("Socket %d is not found in SocketEntries.", socket));
@@ -271,8 +271,7 @@ bool PortEventPoll::deleteEvents(sock_t socket, Command* command,
 bool PortEventPoll::addNameResolver(
     const std::shared_ptr<AsyncNameResolver>& resolver, Command* command)
 {
-  std::shared_ptr<KAsyncNameResolverEntry> entry(
-      new KAsyncNameResolverEntry(resolver, command));
+  auto entry = std::make_shared<KAsyncNameResolverEntry>(resolver, command);
   KAsyncNameResolverEntrySet::iterator itr = nameResolverEntries_.find(entry);
   if (itr == nameResolverEntries_.end()) {
     nameResolverEntries_.insert(entry);
@@ -287,8 +286,7 @@ bool PortEventPoll::addNameResolver(
 bool PortEventPoll::deleteNameResolver(
     const std::shared_ptr<AsyncNameResolver>& resolver, Command* command)
 {
-  std::shared_ptr<KAsyncNameResolverEntry> entry(
-      new KAsyncNameResolverEntry(resolver, command));
+  auto entry = std::make_shared<KAsyncNameResolverEntry>(resolver, command);
   KAsyncNameResolverEntrySet::iterator itr = nameResolverEntries_.find(entry);
   if (itr == nameResolverEntries_.end()) {
     return false;
diff --git a/src/WebSocketResponseCommand.cc b/src/WebSocketResponseCommand.cc
index a06c9a01..1fe92ee2 100644
--- a/src/WebSocketResponseCommand.cc
+++ b/src/WebSocketResponseCommand.cc
@@ -55,8 +55,8 @@ WebSocketResponseCommand::~WebSocketResponseCommand() = default;
 void WebSocketResponseCommand::afterSend(
     const std::shared_ptr<HttpServer>& httpServer, DownloadEngine* e)
 {
-  std::shared_ptr<WebSocketSession> wsSession(
-      new WebSocketSession(httpServer->getSocket(), getDownloadEngine()));
+  auto wsSession = std::make_shared<WebSocketSession>(
+      httpServer->getSocket(), getDownloadEngine());
   auto command = make_unique<WebSocketInteractionCommand>(
       getCuid(), wsSession, e, wsSession->getSocket());
   wsSession->setCommand(command.get());