diff --git a/src/shrpx.cc b/src/shrpx.cc
index 1d6166d1..1d60782b 100644
--- a/src/shrpx.cc
+++ b/src/shrpx.cc
@@ -421,19 +421,11 @@ void graceful_shutdown_signal_cb(struct ev_loop *loop, ev_signal *w,
 }
 } // namespace
 
-namespace {
-std::unique_ptr<std::string> generate_time() {
-  return util::make_unique<std::string>(
-      util::format_common_log(std::chrono::system_clock::now()));
-}
-} // namespace
-
 namespace {
 void refresh_cb(struct ev_loop *loop, ev_timer *w, int revents) {
   auto listener_handler = static_cast<ListenHandler *>(w->data);
   auto worker_stat = listener_handler->get_worker_stat();
 
-  mod_config()->cached_time = generate_time();
   // In multi threaded mode (get_config()->num_worker > 1), we have to
   // wait for event notification to workers to finish.
   if (get_config()->num_worker == 1 && worker_config->graceful_shutdown &&
@@ -698,7 +690,6 @@ void fill_default_config() {
   nghttp2_option_set_no_auto_window_update(mod_config()->http2_option, 1);
 
   mod_config()->tls_proto_mask = 0;
-  mod_config()->cached_time = generate_time();
   mod_config()->no_location_rewrite = false;
   mod_config()->argc = 0;
   mod_config()->argv = nullptr;
diff --git a/src/shrpx_config.h b/src/shrpx_config.h
index 3ab7dcd1..bce05092 100644
--- a/src/shrpx_config.h
+++ b/src/shrpx_config.h
@@ -169,7 +169,6 @@ struct Config {
   std::vector<std::pair<std::string, std::string>> add_response_headers;
   std::vector<unsigned char> alpn_prefs;
   std::vector<LogFragment> accesslog_format;
-  std::shared_ptr<std::string> cached_time;
   std::vector<DownstreamAddr> downstream_addrs;
   // binary form of http proxy host and port
   sockaddr_union downstream_http_proxy_addr;
diff --git a/src/shrpx_log.cc b/src/shrpx_log.cc
index a7b517f7..918bad50 100644
--- a/src/shrpx_log.cc
+++ b/src/shrpx_log.cc
@@ -122,16 +122,16 @@ Log::~Log() {
   char buf[4096];
   auto tty = wconf->errorlog_tty;
 
-  auto cached_time = get_config()->cached_time;
+  auto time_now = util::format_common_log(std::chrono::system_clock::now());
 
   if (severity_ == NOTICE) {
-    rv = snprintf(buf, sizeof(buf), "%s PID%d [%s%s%s] %s\n",
-                  cached_time->c_str(), get_config()->pid,
-                  tty ? SEVERITY_COLOR[severity_] : "", SEVERITY_STR[severity_],
-                  tty ? "\033[0m" : "", stream_.str().c_str());
+    rv = snprintf(buf, sizeof(buf), "%s PID%d [%s%s%s] %s\n", time_now.c_str(),
+                  get_config()->pid, tty ? SEVERITY_COLOR[severity_] : "",
+                  SEVERITY_STR[severity_], tty ? "\033[0m" : "",
+                  stream_.str().c_str());
   } else {
     rv = snprintf(buf, sizeof(buf), "%s PID%d [%s%s%s] %s%s:%d%s %s\n",
-                  cached_time->c_str(), get_config()->pid,
+                  time_now.c_str(), get_config()->pid,
                   tty ? SEVERITY_COLOR[severity_] : "", SEVERITY_STR[severity_],
                   tty ? "\033[0m" : "", tty ? "\033[1;30m" : "", filename_,
                   linenum_, tty ? "\033[0m" : "", stream_.str().c_str());