diff --git a/src/utun_instance.h b/src/utun_instance.h
index 18b8d2fa..07cfb16e 100644
--- a/src/utun_instance.h
+++ b/src/utun_instance.h
@@ -75,6 +75,7 @@ struct UTUN_INSTANCE {
     struct SC_MYKEYS my_keys;
 
     uint8_t my_ed25519_pubkey[SC_PUBKEY_SIZE];  // свой Ed25519 pubkey (для подписи метрик)
+    uint8_t my_ed25519_privkey[SC_PRIVKEY_SIZE]; // свой Ed25519 privkey (derived from X25519)
     
     uint8_t next_socket_id;  // Counter for unique socket IDs (0-255)