diff --git a/config.ml b/config.ml
index 9eaa695..21cc483 100644
--- a/config.ml
+++ b/config.ml
@@ -16,7 +16,13 @@ module Zone = struct
   let rec of_json = function
     | `String str ->
         str |> V6.Prefix.of_string |> Result.map ipv6
+        &?> (str |> V6.of_string
+            |> Result.map V6.Prefix.of_addr
+            |> Result.map ipv6)
         &?> (str |> V4.Prefix.of_string |> Result.map ipv4)
+        &?> (str |> V4.of_string
+            |> Result.map V4.Prefix.of_addr
+            |> Result.map ipv4)
         &> (str |> name)
     | `Assoc [ ("not", json) ] -> Not (of_json json)
     | `List list -> List (List.map of_json list)
@@ -34,7 +40,9 @@ module Addrs = struct
     let open Yojson.Basic.Util in
     let str = json |> to_string in
     str |> V6.Prefix.of_string |> Result.map ipv6
+    &?> (str |> V6.of_string |> Result.map V6.Prefix.of_addr |> Result.map ipv6)
     &?> (str |> V4.Prefix.of_string |> Result.map ipv4)
+    &?> (str |> V4.of_string |> Result.map V4.Prefix.of_addr |> Result.map ipv4)
     &> (str |> name)
 end