diff --git a/tests/xdg-theme.c b/tests/xdg-theme.c
index 5f4c06a..9427f9a 100644
--- a/tests/xdg-theme.c
+++ b/tests/xdg-theme.c
@@ -503,9 +503,11 @@ main(int argc, char *argv[])
     g_setenv("HOME", "/var/empty", TRUE);
     g_setenv("XDG_DATA_HOME", "/var/empty", TRUE);
     g_setenv("XDG_DATA_DIRS", "/usr/share/", TRUE);
+    g_setenv("XDG_SESSION_DESKTOP", "", TRUE);
     g_setenv("XDG_CURRENT_DESKTOP", "", TRUE);
     g_setenv("GNOME_DESKTOP_SESSION_ID", "", TRUE);
     g_setenv("KDE_FULL_SESSION", "", TRUE);
+    g_setenv("DESKTOP_SESSION", "", TRUE);
 
     gsize i;
     for ( i = 0 ; i < G_N_ELEMENTS(_nk_uuid_tests_list) ; ++i )