diff --git a/nixos/tests/mpv.nix b/nixos/tests/mpv.nix
index 07d8b9fb3b96..6934dbc35d45 100644
--- a/nixos/tests/mpv.nix
+++ b/nixos/tests/mpv.nix
@@ -16,9 +16,14 @@ in
           scripts = [ pkgs.mpvScripts.simple-mpv-webui ];
         })
       ];
+
+      environment.etc."mpv/mpv.conf".text = ''
+        [nixos-test-profile]
+      '';
     };
 
   testScript = ''
+    machine.succeed("mpv --profile=help | grep -F nixos-test-profile")
     machine.execute("set -m; mpv --script-opts=webui-port=${port} --idle=yes >&2 &")
     machine.wait_for_open_port(${port})
     assert "<title>simple-mpv-webui" in machine.succeed("curl -s localhost:${port}")