diff --git a/zone-to-zonefile.nix b/zone-to-zonefile.nix
index 0c40d79..62ca5ac 100644
--- a/zone-to-zonefile.nix
+++ b/zone-to-zonefile.nix
@@ -59,7 +59,7 @@ let
   hostToFqdn = host:
     if isNotNull (builtins.match "[^.]+\\.$" host) then
       host
-    else if isNotNull (builtins.match "[^.]+\\[^.]+$" host) then
+    else if isNotNull (builtins.match "[^.]+\\.[^.]+$" host) then
       "${host}."
     else if (hasAttr host zone.hosts) then
       "${host}.${domain}."