diff --git a/examples/shrpx.cc b/examples/shrpx.cc
index 9da9b972..90aa205a 100644
--- a/examples/shrpx.cc
+++ b/examples/shrpx.cc
@@ -527,8 +527,8 @@ int main(int argc, char **argv)
 
   if(conf_exists(get_config()->conf_path)) {
     if(load_config(get_config()->conf_path) == -1) {
-      std::cerr << "Failed to load configuration from "
-                << get_config()->conf_path << std::endl;
+      LOG(FATAL) << "Failed to load configuration from "
+                 << get_config()->conf_path;
       exit(EXIT_FAILURE);
     }
   }
@@ -536,7 +536,7 @@ int main(int argc, char **argv)
   if((!get_config()->private_key_file || !get_config()->cert_file) &&
      argc - optind < 2) {
     print_usage(std::cerr);
-    std::cerr << "Too few arguments" << std::endl;
+    LOG(FATAL) << "Too few arguments";
     exit(EXIT_FAILURE);
   }
   if(argc - optind >= 2) {
@@ -548,7 +548,7 @@ int main(int argc, char **argv)
 
   for(size_t i = 0, len = cmdcfgs.size(); i < len; ++i) {
     if(parse_config(cmdcfgs[i].first, cmdcfgs[i].second) == -1) {
-      std::cerr << "Failed to parse command-line argument." << std::endl;
+      LOG(FATAL) << "Failed to parse command-line argument.";
       exit(EXIT_FAILURE);
     }
   }
@@ -576,7 +576,7 @@ int main(int argc, char **argv)
 
   if(get_config()->daemon) {
     if(daemon(0, 0) == -1) {
-      perror("daemon");
+      LOG(FATAL) << "Failed to daemonize: " << strerror(errno);
       exit(EXIT_FAILURE);
     }
   }
@@ -585,15 +585,15 @@ int main(int argc, char **argv)
   }
   if(getuid() == 0 && get_config()->uid != 0) {
     if(setgid(get_config()->gid) != 0) {
-      std::cerr << "Could not change gid: " << strerror(errno) << std::endl;
+      LOG(FATAL) << "Could not change gid: " << strerror(errno);
       exit(EXIT_FAILURE);
     }
     if(setuid(get_config()->uid) != 0) {
-      std::cerr << "Could not change uid: " << strerror(errno) << std::endl;
+      LOG(FATAL) << "Could not change uid: " << strerror(errno);
       exit(EXIT_FAILURE);
     }
     if(setuid(0) != -1) {
-      std::cerr << "FATAL: Still have root privileges?" << std::endl;
+      LOG(FATAL) << "Still have root privileges?";
       exit(EXIT_FAILURE);
     }
   }
diff --git a/examples/shrpx_config.cc b/examples/shrpx_config.cc
index eb6d5005..5f57385e 100644
--- a/examples/shrpx_config.cc
+++ b/examples/shrpx_config.cc
@@ -31,8 +31,8 @@
 #include <cerrno>
 #include <limits>
 #include <fstream>
-#include <iostream>
 
+#include "shrpx_log.h"
 #include "util.h"
 
 using namespace spdylay;
@@ -115,12 +115,12 @@ int split_host_port(char *host, size_t hostlen, uint16_t *port_ptr,
   // host and port in |hostport| is separated by single ','.
   const char *p = strchr(hostport, ',');
   if(!p) {
-    std::cerr << "Invalid host, port: " << hostport << std::endl;
+    LOG(ERROR) << "Invalid host, port: " << hostport;
     return -1;
   }
   size_t len = p-hostport;
   if(hostlen < len+1) {
-    std::cerr << "Hostname too long: " << hostport << std::endl;
+    LOG(ERROR) << "Hostname too long: " << hostport;
     return -1;
   }
   memcpy(host, hostport, len);
@@ -132,7 +132,7 @@ int split_host_port(char *host, size_t hostlen, uint16_t *port_ptr,
     *port_ptr = d;
     return 0;
   } else {
-    std::cerr << "Port is invalid: " << p+1 << std::endl;
+    LOG(ERROR) << "Port is invalid: " << p+1;
     return -1;
   }
 }
@@ -170,7 +170,7 @@ int parse_config(const char *opt, const char *optarg)
     mod_config()->spdy_max_concurrent_streams = strtol(optarg, 0, 10);
   } else if(util::strieq(opt, SHRPX_OPT_LOG_LEVEL)) {
     if(Log::set_severity_level_by_name(optarg) == -1) {
-      std::cerr << "Invalid severity level: " << optarg << std::endl;
+      LOG(ERROR) << "Invalid severity level: " << optarg;
       return -1;
     }
   } else if(util::strieq(opt, SHRPX_OPT_DAEMON)) {
@@ -205,8 +205,7 @@ int parse_config(const char *opt, const char *optarg)
     if(errno == 0 && n < 31) {
       mod_config()->spdy_upstream_window_bits = n;
     } else {
-      std::cerr << "-w: specify the integer in the range [0, 30], inclusive"
-                << std::endl;
+      LOG(ERROR) << "-w: specify the integer in the range [0, 30], inclusive";
       return -1;
     }
   } else if(util::strieq(opt, SHRPX_OPT_PID_FILE)) {
@@ -214,8 +213,8 @@ int parse_config(const char *opt, const char *optarg)
   } else if(util::strieq(opt, SHRPX_OPT_USER)) {
     passwd *pwd = getpwnam(optarg);
     if(pwd == 0) {
-      std::cerr << "--user: failed to get uid from " << optarg
-                << ": " << strerror(errno) << std::endl;
+      LOG(ERROR) << "--user: failed to get uid from " << optarg
+                 << ": " << strerror(errno);
       return -1;
     }
     mod_config()->uid = pwd->pw_uid;
@@ -225,9 +224,9 @@ int parse_config(const char *opt, const char *optarg)
   } else if(util::strieq(opt, SHRPX_OPT_CERTIFICATE_FILE)) {
     set_config_str(&mod_config()->cert_file, optarg);
   } else if(util::strieq(opt, "conf")) {
-    std::cerr << "conf is ignored" << std::endl;
+    LOG(WARNING) << "conf is ignored";
   } else {
-    std::cerr << "Unknown option: " << opt << std::endl;
+    LOG(ERROR) << "Unknown option: " << opt;
     return -1;
   }
   return 0;
@@ -237,7 +236,7 @@ int load_config(const char *filename)
 {
   std::ifstream in(filename, std::ios::binary);
   if(!in) {
-    std::cerr << "Could not open config file " << filename << std::endl;
+    LOG(ERROR) << "Could not open config file " << filename;
     return -1;
   }
   std::string line;
@@ -251,7 +250,7 @@ int load_config(const char *filename)
     size_t size = line.size();
     for(i = 0; i < size && line[i] != '='; ++i);
     if(i == size) {
-      std::cerr << "Bad configuration format at line " << linenum << std::endl;
+      LOG(ERROR) << "Bad configuration format at line " << linenum;
       return -1;
     }
     line[i] = '\0';