diff --git a/include/opendht/value.h b/include/opendht/value.h
index 43f2f75320050d9c3000dc2b6b8133476630b2b0..2298a57f6b598c6de7e0f217f2b6f27d784cf01c 100644
--- a/include/opendht/value.h
+++ b/include/opendht/value.h
@@ -43,8 +43,9 @@
 #endif
 
 namespace dht {
+using namespace std::literals;
 
-static const std::string VALUE_KEY_ID("id");
+static constexpr auto VALUE_KEY_ID("id");
 static const std::string VALUE_KEY_DAT("dat");
 static const std::string VALUE_KEY_PRIO("p");
 static const std::string VALUE_KEY_SIGNATURE("sig");