diff --git a/src/sound/snd_sn76489.c b/src/sound/snd_sn76489.c
index e04ca7e5e..e4ba68742 100644
--- a/src/sound/snd_sn76489.c
+++ b/src/sound/snd_sn76489.c
@@ -305,6 +305,7 @@ const device_t tndy_device =
         tndy_device_init,
         sn76489_device_close,
 	NULL, { NULL }, NULL,
+        NULL,
         tndy_config
 };
 #endif