diff --git a/spa/include/spa/param/audio/layout-types.h b/spa/include/spa/param/audio/layout-types.h
index c8c78af39..33650202a 100644
--- a/spa/include/spa/param/audio/layout-types.h
+++ b/spa/include/spa/param/audio/layout-types.h
@@ -75,7 +75,7 @@ static const struct spa_type_audio_layout_info {
 	{ "7.1", { SPA_AUDIO_LAYOUT_7_1 } },
 	{ "7.1W", { SPA_AUDIO_LAYOUT_7_1W } },
 	{ "7.1WR", { SPA_AUDIO_LAYOUT_7_1WR } },
-	{ NULL, },
+	{ NULL, { 0, { SPA_AUDIO_CHANNEL_UNKNOWN } } },
 };
 
 SPA_API_AUDIO_LAYOUT_TYPES int