diff --git a/modules/clan/router/wifi.nix b/modules/clan/router/wifi.nix
index fe8e2cf..6ab5ffe 100644
--- a/modules/clan/router/wifi.nix
+++ b/modules/clan/router/wifi.nix
@@ -120,6 +120,13 @@ in
         );
         message = "router: wifi.radios.<radio>.macAddress is required for radios broadcasting more than one network.";
       }
+      {
+        assertion =
+          !config.networking.wireless.enable
+          && !config.networking.wireless.iwd.enable
+          && !config.networking.networkmanager.enable;
+        message = "router: wifi.enable needs the radios for hostapd; disable networking.wireless (wpa_supplicant), iwd and NetworkManager.";
+      }
     ];
 
     # Regulatory database for the kernel, so countryCode actually applies.