diff --git a/glnx-backports.h b/glnx-backports.h
index 0c5fabe9..3de9370f 100644
--- a/glnx-backports.h
+++ b/glnx-backports.h
@@ -64,6 +64,10 @@ gboolean              glnx_set_object  (GObject **object_ptr,
 
 #endif /* !GLIB_CHECK_VERSION(2, 44, 0) */
 
+#if !GLIB_CHECK_VERSION(2, 38, 0)
+#define G_SPAWN_DEFAULT ((GSpawnFlags) 0)
+#endif
+
 #ifndef g_assert_nonnull
 #define g_assert_nonnull(x) g_assert (x != NULL)
 #endif