diff --git a/rdmnet/rdmnet.h b/rdmnet/rdmnet.h
index fc0f3fb..999409e 100644
--- a/rdmnet/rdmnet.h
+++ b/rdmnet/rdmnet.h
@@ -23,8 +23,6 @@
 */
 #pragma once
 
-#include <string>
-
 #include "rdm/rdm.h"
 #include "uuid/uuid.h"
 
@@ -35,9 +33,9 @@ namespace RDMnet {
 // MDNS_IPV4_MULTICAST_ADDRESS 224.0.0.251 (Informative)
 // MDNS_IPV6_MULTICAST_ADDRESS ff02::fb (Informative)
   static const uint16_t MDNS_PORT                   = 5353;   //!< (Informative)
-  static const std::string E133_DNSSD_PRI_SRV_TYPE  = "_rdmnet._tcp";
-  static const std::string E133_DEFAULT_SCOPE       = "default";
-  static const std::string E133_DEFAULT_DOMAIN      = "local.";
+  static const char*    E133_DNSSD_PRI_SRV_TYPE     = "_rdmnet._tcp";
+  static const char*    E133_DEFAULT_SCOPE          = "default";
+  static const char*    E133_DEFAULT_DOMAIN         = "local.";
   static const uint8_t  E133_DNSSD_TXTVERS          = 1;
   static const uint8_t  E133_TCP_HEARTBEAT_INTERVAL = 15;     //!< seconds
   static const uint8_t  E133_HEARTBEAT_TIMEOUT      = 45;     //!< seconds