diff --git a/gio/tests/gdbus-threading.c b/gio/tests/gdbus-threading.c
index 8323dd2..da1f7e6 100644
--- a/gio/tests/gdbus-threading.c
+++ b/gio/tests/gdbus-threading.c
@@ -679,6 +679,12 @@ main (int   argc,
 
   g_test_init (&argc, &argv, NULL);
 
+  if (g_getenv ("DEB_ALLOW_FLAKY_TESTS") == NULL)
+    {
+      g_print("ok 1 # SKIP all gdbus-threading tests skipped because they are too unreliable (glib#1515)\n");
+      return 77;
+    }
+
   session_bus_up ();
 
   /* this is safe; testserver will exit once the bus goes away */