diff --git a/tools/ndn-autoconfig/dns-srv.cpp b/tools/ndn-autoconfig/dns-srv.cpp
index bc0b3a6..ee1970e 100644
--- a/tools/ndn-autoconfig/dns-srv.cpp
+++ b/tools/ndn-autoconfig/dns-srv.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -110,7 +110,7 @@
     NDN_THROW(DnsSrvError("SRV record cannot be parsed (error decoding host name)"));
   }
 
-  return "udp://"s + hostName + ":" + to_string(port);
+  return "udp://"s + hostName + ":" + std::to_string(port);
 }
 
 std::string
diff --git a/tools/ndn-autoconfig/multicast-discovery.cpp b/tools/ndn-autoconfig/multicast-discovery.cpp
index 61312cd..dca08fc 100644
--- a/tools/ndn-autoconfig/multicast-discovery.cpp
+++ b/tools/ndn-autoconfig/multicast-discovery.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2023,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -55,7 +55,7 @@
     filter,
     [this] (const auto& dataset) { registerHubDiscoveryPrefix(dataset); },
     [this] (uint32_t code, const std::string& reason) {
-      fail("Error " + to_string(code) + " when querying multi-access faces: " + reason);
+      fail("Error " + std::to_string(code) + " when querying multi-access faces: " + reason);
     });
 }
 
@@ -119,7 +119,7 @@
     parameters,
     [this] (const auto&) { requestHubData(); },
     [this] (const auto& resp) {
-      fail("Error " + to_string(resp.getCode()) + " when setting multicast strategy: " + resp.getText());
+      fail("Error " + std::to_string(resp.getCode()) + " when setting multicast strategy: " + resp.getText());
     });
 }
 
diff --git a/tools/ndn-autoconfig/ndn-fch-discovery.cpp b/tools/ndn-autoconfig/ndn-fch-discovery.cpp
index 0e5c6b0..51234fc 100644
--- a/tools/ndn-autoconfig/ndn-fch-discovery.cpp
+++ b/tools/ndn-autoconfig/ndn-fch-discovery.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2023,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -181,7 +181,7 @@
     }
     if (statusCode != 200) {
       boost::trim(statusMessage);
-      NDN_THROW(HttpException("HTTP request failed: " + to_string(statusCode) + " " + statusMessage));
+      NDN_THROW(HttpException("HTTP request failed: " + std::to_string(statusCode) + " " + statusMessage));
     }
     std::string header;
     while (std::getline(requestStream, header) && header != "\r")