diff --git a/daemon/common/config-file.hpp b/daemon/common/config-file.hpp
index fac8da8..06cd70b 100644
--- a/daemon/common/config-file.hpp
+++ b/daemon/common/config-file.hpp
@@ -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) 2014-2023,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -115,7 +115,7 @@
     auto value = node.get_value_optional<T>();
     // Unsigned logic is workaround for https://redmine.named-data.net/issues/4489
     if (value &&
-        (std::is_signed<T>() || node.get_value<std::string>().find("-") == std::string::npos)) {
+        (std::is_signed_v<T> || node.get_value<std::string>().find("-") == std::string::npos)) {
       return *value;
     }
     NDN_THROW(Error("Invalid value '" + node.get_value<std::string>() +