diff --git a/config/lnbits.nix b/config/lnbits.nix
index 3ec45c8..9411ae8 100644
--- a/config/lnbits.nix
+++ b/config/lnbits.nix
@@ -37,7 +37,7 @@ in
       # LNBITS_EXTENSIONS_DEFAULT_INSTALL =
       #   "nostrclient,nostrmarket,nostrrelay,lnurlp,events";
       LNBITS_ADMIN_EXTENSIONS = "ngrok,nostrclient,nostrrelay,satmachineadmin";
-      LNBITS_USER_DEFAULT_EXTENSIONS = "lnurlp,nostrmarket,events,lndhub";
+      LNBITS_USER_DEFAULT_EXTENSIONS = "lnurlp,nostrmarket,events,castle,lndhub";
       LNBITS_CUSTOM_FRONTEND_URL = "https://app.${domain}";
     };
   };