diff --git a/glib/gtestutils.c b/glib/gtestutils.c
index 874d5dc068e94f134c9f75ae91c7067343ccc479..afa3206ba1310382979413a9830176d3115e21ad 100644
--- a/glib/gtestutils.c
+++ b/glib/gtestutils.c
@@ -3173,7 +3173,7 @@ g_test_trap_subprocess (const char           *test_path,
     }
   g_ptr_array_add (argv, NULL);
 
-  flags = G_SPAWN_DO_NOT_REAP_CHILD;
+  flags = G_SPAWN_DO_NOT_REAP_CHILD | G_SPAWN_LEAVE_DESCRIPTORS_OPEN;
   if (test_flags & G_TEST_TRAP_INHERIT_STDIN)
     flags |= G_SPAWN_CHILD_INHERITS_STDIN;