diff --git a/tests/desktop_login.pm b/tests/desktop_login.pm
index f37ac4ce..6f0d5a4d 100644
--- a/tests/desktop_login.pm
+++ b/tests/desktop_login.pm
@@ -197,6 +197,9 @@ sub run {
     if ($desktop eq "gnome") {
         # suppress the Welcome Tour for new users in GNOME 40+
         assert_script_run 'printf "[org.gnome.shell]\nwelcome-dialog-last-shown-version=\'4294967295\'\n" > /usr/share/glib-2.0/schemas/org.gnome.shell.gschema.override';
+        # Disable automatic update installation (so we don't install an update
+        # to fXX-backgrounds and put the 'real' image back when we reboot)
+        assert_script_run 'printf "[org.gnome.software]\ndownload-updates=false\n" > /usr/share/glib-2.0/schemas/org.gnome.software.gschema.override';
         assert_script_run 'glib-compile-schemas /usr/share/glib-2.0/schemas';
         # In Gnome, we can create a passwordless user that can provide his password upon
         # the first login. So we can create the second user in this way to test this feature