diff --git a/nixos/tests/installed-tests/flatpak-builder.nix b/nixos/tests/installed-tests/flatpak-builder.nix
index 31b9f2b258fd..41f4060fb69e 100644
--- a/nixos/tests/installed-tests/flatpak-builder.nix
+++ b/nixos/tests/installed-tests/flatpak-builder.nix
@@ -6,6 +6,7 @@ makeInstalledTest {
   testConfig = {
     services.flatpak.enable = true;
     xdg.portal.enable = true;
+    xdg.portal.extraPortals = with pkgs; [ xdg-desktop-portal-gtk ];
     environment.systemPackages = with pkgs; [ flatpak-builder ] ++ flatpak-builder.installedTestsDependencies;
     virtualisation.diskSize = 2048;
   };