diff --git a/meta/options.nix b/meta/options.nix
index 5e94742..198c9a3 100644
--- a/meta/options.nix
+++ b/meta/options.nix
@@ -124,6 +124,7 @@ in
 
       external = mkOption {
         type = attrsOf (listOf str);
+        default = { };
         description = ''
           External services used by the DGNum organization.
         '';
@@ -149,6 +150,7 @@ in
             };
           };
         });
+        default = { };
         description = ''
           Administrator access of the different DGNum services,
           it is mainly indicative as most services cannot configure this statically.
@@ -336,6 +338,7 @@ in
 
               netbirdIp = mkOption {
                 type = nullOr str;
+                default = null;
                 description = ''
                   IP address of the node in the netbird network.
                 '';