diff --git a/nixos/modules/services/networking/wireguard.nix b/nixos/modules/services/networking/wireguard.nix
index ff8e54a1ce20..e8f83f6dd8bf 100644
--- a/nixos/modules/services/networking/wireguard.nix
+++ b/nixos/modules/services/networking/wireguard.nix
@@ -428,7 +428,7 @@ in
       ++ (attrValues (
         mapAttrs (name: value: {
           assertion = value.generatePrivateKeyFile -> (value.privateKey == null);
-          message = "networking.wireguard.interfaces.${name}.generatePrivateKey must not be set if networking.wireguard.interfaces.${name}.privateKey is set.";
+          message = "networking.wireguard.interfaces.${name}.generatePrivateKeyFile must not be set if networking.wireguard.interfaces.${name}.privateKey is set.";
         }) cfg.interfaces))
         ++ map ({ interfaceName, peer, ... }: {
           assertion = (peer.presharedKey == null) || (peer.presharedKeyFile == null);