diff --git a/nixos/tests/magnetico.nix b/nixos/tests/magnetico.nix
index bc7aef653ee..2b1af8328da 100644
--- a/nixos/tests/magnetico.nix
+++ b/nixos/tests/magnetico.nix
@@ -1,4 +1,9 @@
-import ./make-test.nix ({ pkgs, ...} : {
+import ./make-test.nix ({ pkgs, ...} :
+
+let
+  port = 8081;
+in
+{
   name = "magnetico";
   meta = with pkgs.stdenv.lib.maintainers; {
     maintainers = [ rnhmjoj ];
@@ -12,6 +17,7 @@ import ./make-test.nix ({ pkgs, ...} : {
     services.magnetico = {
       enable = true;
       crawler.port = 9000;
+      web.port = port;
       web.credentials.user = "$2y$12$P88ZF6soFthiiAeXnz64aOWDsY3Dw7Yw8fZ6GtiqFNjknD70zDmNe";
     };
   };
@@ -21,8 +27,10 @@ import ./make-test.nix ({ pkgs, ...} : {
       startAll;
       $machine->waitForUnit("magneticod");
       $machine->waitForUnit("magneticow");
-      $machine->succeed("${pkgs.curl}/bin/curl -u user:password http://localhost:8080");
-      $machine->succeed("${pkgs.curl}/bin/curl -u user:wrongpwd http://localhost:8080") =~ "Unauthorised." or die;
+      $machine->succeed("${pkgs.curl}/bin/curl ".
+        "-u user:password http://localhost:${toString port}");
+      $machine->succeed("${pkgs.curl}/bin/curl ".
+        "-u user:wrongpwd http://localhost:${toString port}") =~ "Unauthorised." or die;
       $machine->shutdown();
     '';
 })