diff --git a/cores/esp32/IPAddress.h b/cores/esp32/IPAddress.h
index a24271cd580..b88aeed3026 100644
--- a/cores/esp32/IPAddress.h
+++ b/cores/esp32/IPAddress.h
@@ -124,6 +124,9 @@ class IPAddress : public Printable {
   friend class UDP;
   friend class Client;
   friend class Server;
+  friend class EthernetClass;
+  friend class DhcpClass;
+  friend class DNSClient;
 
 protected:
   bool fromString4(const char *address);