diff --git a/src/HttpServer.cc b/src/HttpServer.cc
index 02279ad1..6936bc85 100644
--- a/src/HttpServer.cc
+++ b/src/HttpServer.cc
@@ -1666,7 +1666,6 @@ int verify_callback(int preverify_ok, X509_STORE_CTX *ctx) {
 namespace {
 int start_listen(HttpServer *sv, struct ev_loop *loop, Sessions *sessions,
                  const Config *config) {
-  addrinfo hints;
   int r;
   bool ok = false;
   const char *addr = nullptr;
@@ -1674,7 +1673,7 @@ int start_listen(HttpServer *sv, struct ev_loop *loop, Sessions *sessions,
   auto acceptor = std::make_shared<AcceptHandler>(sv, sessions, config);
   auto service = util::utos(config->port);
 
-  memset(&hints, 0, sizeof(addrinfo));
+  addrinfo hints{};
   hints.ai_family = AF_UNSPEC;
   hints.ai_socktype = SOCK_STREAM;
   hints.ai_flags = AI_PASSIVE;
diff --git a/src/h2load.cc b/src/h2load.cc
index 918e0f42..32763a0a 100644
--- a/src/h2load.cc
+++ b/src/h2load.cc
@@ -841,9 +841,8 @@ process_time_stats(const std::vector<std::unique_ptr<Worker>> &workers) {
 namespace {
 void resolve_host() {
   int rv;
-  addrinfo hints, *res;
+  addrinfo hints{}, *res;
 
-  memset(&hints, 0, sizeof(hints));
   hints.ai_family = AF_UNSPEC;
   hints.ai_socktype = SOCK_STREAM;
   hints.ai_protocol = 0;
@@ -906,8 +905,7 @@ std::vector<std::string> parse_uris(Iterator first, Iterator last) {
 
   // First URI is treated specially.  We use scheme, host and port of
   // this URI and ignore those in the remaining URIs if present.
-  http_parser_url u;
-  memset(&u, 0, sizeof(u));
+  http_parser_url u{};
 
   if (first == last) {
     std::cerr << "no URI available" << std::endl;
@@ -935,8 +933,7 @@ std::vector<std::string> parse_uris(Iterator first, Iterator last) {
   reqlines.push_back(get_reqline(uri, u));
 
   for (; first != last; ++first) {
-    http_parser_url u;
-    memset(&u, 0, sizeof(u));
+    http_parser_url u{};
 
     auto uri = (*first).c_str();
 
@@ -1333,8 +1330,7 @@ int main(int argc, char **argv) {
     config.data_length = data_stat.st_size;
   }
 
-  struct sigaction act;
-  memset(&act, 0, sizeof(struct sigaction));
+  struct sigaction act {};
   act.sa_handler = SIG_IGN;
   sigaction(SIGPIPE, &act, nullptr);
 
diff --git a/src/http2_test.cc b/src/http2_test.cc
index 88339045..9a99a3a9 100644
--- a/src/http2_test.cc
+++ b/src/http2_test.cc
@@ -191,8 +191,7 @@ void check_rewrite_location_uri(const std::string &want, const std::string &uri,
                                 const std::string &match_host,
                                 const std::string &req_authority,
                                 const std::string &upstream_scheme) {
-  http_parser_url u;
-  memset(&u, 0, sizeof(u));
+  http_parser_url u{};
   CU_ASSERT(0 == http_parser_parse_url(uri.c_str(), uri.size(), 0, &u));
   auto got = http2::rewrite_location_uri(uri, u, match_host, req_authority,
                                          upstream_scheme);
diff --git a/src/nghttp.cc b/src/nghttp.cc
index eb423c6d..8f85aaca 100644
--- a/src/nghttp.cc
+++ b/src/nghttp.cc
@@ -501,9 +501,8 @@ bool HttpClient::need_upgrade() const {
 
 int HttpClient::resolve_host(const std::string &host, uint16_t port) {
   int rv;
-  addrinfo hints;
   this->host = host;
-  memset(&hints, 0, sizeof(hints));
+  addrinfo hints{};
   hints.ai_family = AF_UNSPEC;
   hints.ai_socktype = SOCK_STREAM;
   hints.ai_protocol = 0;
@@ -1260,8 +1259,7 @@ bool HttpClient::add_request(const std::string &uri,
                              const nghttp2_data_provider *data_prd,
                              int64_t data_length,
                              const nghttp2_priority_spec &pri_spec, int level) {
-  http_parser_url u;
-  memset(&u, 0, sizeof(u));
+  http_parser_url u{};
   if (http_parser_parse_url(uri.c_str(), uri.size(), 0, &u) != 0) {
     return false;
   }
@@ -1485,8 +1483,7 @@ void update_html_parser(HttpClient *client, Request *req, const uint8_t *data,
     auto uri = strip_fragment(p.first.c_str());
     auto res_type = p.second;
 
-    http_parser_url u;
-    memset(&u, 0, sizeof(u));
+    http_parser_url u{};
     if (http_parser_parse_url(uri.c_str(), uri.size(), 0, &u) == 0 &&
         util::fieldeq(uri.c_str(), u, req->uri.c_str(), req->u, UF_SCHEMA) &&
         util::fieldeq(uri.c_str(), u, req->uri.c_str(), req->u, UF_HOST) &&
@@ -1650,8 +1647,7 @@ int on_begin_headers_callback(nghttp2_session *session,
   }
   case NGHTTP2_PUSH_PROMISE: {
     auto stream_id = frame->push_promise.promised_stream_id;
-    http_parser_url u;
-    memset(&u, 0, sizeof(u));
+    http_parser_url u{};
     // TODO Set pri and level
     nghttp2_priority_spec pri_spec;
 
@@ -1820,8 +1816,7 @@ int on_frame_recv_callback2(nghttp2_session *session,
     uri += "://";
     uri += authority->value;
     uri += path->value;
-    http_parser_url u;
-    memset(&u, 0, sizeof(u));
+    http_parser_url u{};
     if (http_parser_parse_url(uri.c_str(), uri.size(), 0, &u) != 0) {
       nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
                                 frame->push_promise.promised_stream_id,
@@ -2299,8 +2294,7 @@ int run(char **uris, int n) {
   std::vector<std::tuple<std::string, nghttp2_data_provider *, int64_t>>
       requests;
   for (int i = 0; i < n; ++i) {
-    http_parser_url u;
-    memset(&u, 0, sizeof(u));
+    http_parser_url u{};
     auto uri = strip_fragment(uris[i]);
     if (http_parser_parse_url(uri.c_str(), uri.size(), 0, &u) != 0) {
       std::cerr << "[ERROR] Could not parse URI " << uri << std::endl;
@@ -2701,8 +2695,7 @@ int main(int argc, char **argv) {
   nghttp2_option_set_peer_max_concurrent_streams(
       config.http2_option, config.peer_max_concurrent_streams);
 
-  struct sigaction act;
-  memset(&act, 0, sizeof(struct sigaction));
+  struct sigaction act {};
   act.sa_handler = SIG_IGN;
   sigaction(SIGPIPE, &act, nullptr);
   reset_timer();
diff --git a/src/nghttpd.cc b/src/nghttpd.cc
index e5d7c2e0..7f11efd5 100644
--- a/src/nghttpd.cc
+++ b/src/nghttpd.cc
@@ -371,8 +371,7 @@ int main(int argc, char **argv) {
 
   set_color_output(color || isatty(fileno(stdout)));
 
-  struct sigaction act;
-  memset(&act, 0, sizeof(struct sigaction));
+  struct sigaction act {};
   act.sa_handler = SIG_IGN;
   sigaction(SIGPIPE, &act, nullptr);
 
diff --git a/src/shrpx.cc b/src/shrpx.cc
index d3b1c9fb..b346aa99 100644
--- a/src/shrpx.cc
+++ b/src/shrpx.cc
@@ -119,12 +119,11 @@ const int GRACEFUL_SHUTDOWN_SIGNAL = SIGQUIT;
 namespace {
 int resolve_hostname(sockaddr_union *addr, size_t *addrlen,
                      const char *hostname, uint16_t port, int family) {
-  addrinfo hints;
   int rv;
 
   auto service = util::utos(port);
-  memset(&hints, 0, sizeof(addrinfo));
 
+  addrinfo hints{};
   hints.ai_family = family;
   hints.ai_socktype = SOCK_STREAM;
 #ifdef AI_ADDRCONFIG
@@ -279,12 +278,11 @@ std::unique_ptr<AcceptHandler> create_acceptor(ConnectionHandler *handler,
     }
   }
 
-  addrinfo hints;
   int fd = -1;
   int rv;
 
   auto service = util::utos(get_config()->port);
-  memset(&hints, 0, sizeof(addrinfo));
+  addrinfo hints{};
   hints.ai_family = family;
   hints.ai_socktype = SOCK_STREAM;
   hints.ai_flags = AI_PASSIVE;
@@ -849,7 +847,7 @@ int16_t DEFAULT_DOWNSTREAM_PORT = 80;
 
 namespace {
 void fill_default_config() {
-  memset(mod_config(), 0, sizeof(*mod_config()));
+  *mod_config() = {};
 
   mod_config()->verbose = false;
   mod_config()->daemon = false;
@@ -2359,8 +2357,7 @@ int main(int argc, char **argv) {
     reset_timer();
   }
 
-  struct sigaction act;
-  memset(&act, 0, sizeof(struct sigaction));
+  struct sigaction act {};
   act.sa_handler = SIG_IGN;
   sigaction(SIGPIPE, &act, nullptr);
 
diff --git a/src/shrpx_config.cc b/src/shrpx_config.cc
index 5486fda8..b51d44e2 100644
--- a/src/shrpx_config.cc
+++ b/src/shrpx_config.cc
@@ -1575,8 +1575,7 @@ int parse_config(const char *opt, const char *optarg,
     return 0;
   case SHRPX_OPTID_BACKEND_HTTP_PROXY_URI: {
     // parse URI and get hostname, port and optionally userinfo.
-    http_parser_url u;
-    memset(&u, 0, sizeof(u));
+    http_parser_url u{};
     int rv = http_parser_parse_url(optarg, strlen(optarg), 0, &u);
     if (rv == 0) {
       std::string val;
diff --git a/src/shrpx_connection_handler.cc b/src/shrpx_connection_handler.cc
index cbe828b8..91b477d2 100644
--- a/src/shrpx_connection_handler.cc
+++ b/src/shrpx_connection_handler.cc
@@ -129,9 +129,8 @@ ConnectionHandler::~ConnectionHandler() {
 }
 
 void ConnectionHandler::worker_reopen_log_files() {
-  WorkerEvent wev;
+  WorkerEvent wev{};
 
-  memset(&wev, 0, sizeof(wev));
   wev.type = REOPEN_LOG;
 
   for (auto &worker : workers_) {
@@ -141,9 +140,8 @@ void ConnectionHandler::worker_reopen_log_files() {
 
 void ConnectionHandler::worker_renew_ticket_keys(
     const std::shared_ptr<TicketKeys> &ticket_keys) {
-  WorkerEvent wev;
+  WorkerEvent wev{};
 
-  memset(&wev, 0, sizeof(wev));
   wev.type = RENEW_TICKET_KEYS;
   wev.ticket_keys = ticket_keys;
 
@@ -216,8 +214,7 @@ void ConnectionHandler::graceful_shutdown_worker() {
     return;
   }
 
-  WorkerEvent wev;
-  memset(&wev, 0, sizeof(wev));
+  WorkerEvent wev{};
   wev.type = GRACEFUL_SHUTDOWN;
 
   if (LOG_ENABLED(INFO)) {
@@ -266,8 +263,7 @@ int ConnectionHandler::handle_connection(int fd, sockaddr *addr, int addrlen) {
     LOG(INFO) << "Dispatch connection to worker #" << idx;
   }
   ++worker_round_robin_cnt_;
-  WorkerEvent wev;
-  memset(&wev, 0, sizeof(wev));
+  WorkerEvent wev{};
   wev.type = NEW_CONNECTION;
   wev.client_fd = fd;
   memcpy(&wev.client_addr, addr, addrlen);
diff --git a/src/shrpx_downstream.cc b/src/shrpx_downstream.cc
index 87a2d082..bfd7aa4b 100644
--- a/src/shrpx_downstream.cc
+++ b/src/shrpx_downstream.cc
@@ -621,8 +621,7 @@ void Downstream::rewrite_location_response_header(
   if (!hd) {
     return;
   }
-  http_parser_url u;
-  memset(&u, 0, sizeof(u));
+  http_parser_url u{};
   int rv =
       http_parser_parse_url((*hd).value.c_str(), (*hd).value.size(), 0, &u);
   if (rv != 0) {
diff --git a/src/shrpx_http2_upstream.cc b/src/shrpx_http2_upstream.cc
index 87c77d14..51146e8c 100644
--- a/src/shrpx_http2_upstream.cc
+++ b/src/shrpx_http2_upstream.cc
@@ -1482,8 +1482,7 @@ int Http2Upstream::on_downstream_reset(bool no_retry) {
 
 int Http2Upstream::prepare_push_promise(Downstream *downstream) {
   int rv;
-  http_parser_url u;
-  memset(&u, 0, sizeof(u));
+  http_parser_url u{};
   rv = http_parser_parse_url(downstream->get_request_path().c_str(),
                              downstream->get_request_path().size(), 0, &u);
   if (rv != 0) {
@@ -1513,8 +1512,7 @@ int Http2Upstream::prepare_push_promise(Downstream *downstream) {
       const char *relq = nullptr;
       size_t relqlen = 0;
 
-      http_parser_url v;
-      memset(&v, 0, sizeof(v));
+      http_parser_url v{};
       rv = http_parser_parse_url(link_url, link_urllen, 0, &v);
       if (rv != 0) {
         assert(link_urllen);
diff --git a/src/shrpx_spdy_upstream.cc b/src/shrpx_spdy_upstream.cc
index 5f124296..745cc0b5 100644
--- a/src/shrpx_spdy_upstream.cc
+++ b/src/shrpx_spdy_upstream.cc
@@ -452,8 +452,7 @@ SpdyUpstream::SpdyUpstream(uint16_t version, ClientHandler *handler)
                     : 0,
           !get_config()->http2_proxy),
       handler_(handler), session_(nullptr) {
-  spdylay_session_callbacks callbacks;
-  memset(&callbacks, 0, sizeof(callbacks));
+  spdylay_session_callbacks callbacks{};
   callbacks.send_callback = send_callback;
   callbacks.recv_callback = recv_callback;
   callbacks.on_stream_close_callback = on_stream_close_callback;
diff --git a/src/util.cc b/src/util.cc
index 9586ab77..0f70f0da 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -348,8 +348,7 @@ std::string iso8601_date(int64_t ms) {
 }
 
 time_t parse_http_date(const std::string &s) {
-  tm tm;
-  memset(&tm, 0, sizeof(tm));
+  tm tm{};
   char *r = strptime(s.c_str(), "%a, %d %b %Y %H:%M:%S GMT", &tm);
   if (r == 0) {
     return 0;
@@ -637,9 +636,8 @@ void write_uri_field(std::ostream &o, const char *uri, const http_parser_url &u,
 }
 
 bool numeric_host(const char *hostname) {
-  struct addrinfo hints;
   struct addrinfo *res;
-  memset(&hints, 0, sizeof(hints));
+  struct addrinfo hints {};
   hints.ai_family = AF_UNSPEC;
   hints.ai_flags = AI_NUMERICHOST;
   if (getaddrinfo(hostname, nullptr, &hints, &res)) {