diff --git a/nixos/modules/services/networking/hylafax/default.nix b/nixos/modules/services/networking/hylafax/default.nix
index 6e28e8c5d8bc..4c63b822d165 100644
--- a/nixos/modules/services/networking/hylafax/default.nix
+++ b/nixos/modules/services/networking/hylafax/default.nix
@@ -21,7 +21,7 @@
       message = ''
         HylaFAX cannot be used without modems.
         Please define at least one modem with
-        <option>config.services.hylafax</option>.
+        <option>config.services.hylafax.modems</option>.
       '';
     }];
   };