diff --git a/pressure-vessel/wrap-flatpak.c b/pressure-vessel/wrap-flatpak.c
index fbf45c5e0cf084822635360f218c09a98599b331..37a5f0314f712d2d55934827225908bdc4637463 100644
--- a/pressure-vessel/wrap-flatpak.c
+++ b/pressure-vessel/wrap-flatpak.c
@@ -195,13 +195,6 @@ pv_wrap_check_flatpak (const char *tools_dir,
    * to run their own modified versions of Flatpak and pressure-vessel
    * should be using this, and those people can find this in the
    * source code */
-  else if (g_getenv ("PRESSURE_VESSEL_FLATPAK_PR4018") != NULL)
-    {
-      g_warning ("Assuming your version of Flatpak contains unmerged "
-                 "changes (#4018, #4125, #4126, #4093)");
-      subsandbox = get_subsandbox_adverb (launch_executable);
-    }
-  /* Also deliberately not documented */
   else if (g_getenv ("PRESSURE_VESSEL_FLATPAK_SANDBOX_ESCAPE") != NULL)
     {
       g_autofree gchar *policy = NULL;