diff --git a/spa/include/spa/pod/pod.h b/spa/include/spa/pod/pod.h
index 3111d7690..8033ae0c5 100644
--- a/spa/include/spa/pod/pod.h
+++ b/spa/include/spa/pod/pod.h
@@ -196,6 +196,11 @@ struct spa_pod_prop {
 					  *  object type */
 #define SPA_POD_PROP_FLAG_READONLY	(1u<<0)		/**< is read-only */
 #define SPA_POD_PROP_FLAG_HARDWARE	(1u<<1)		/**< some sort of hardware parameter */
+#define SPA_POD_PROP_FLAG_HINT_DICT	(1u<<2)		/**< contains a dictionary struct as
+							 *   (Struct(
+							 *	  Int : n_items,
+							 *	  (String : key,
+							 *	   String : value)*)) */
 	uint32_t flags;			/**< flags for property */
 	struct spa_pod value;
 	/* value follows */
diff --git a/spa/plugins/alsa/alsa-acp-device.c b/spa/plugins/alsa/alsa-acp-device.c
index ca906f8ef..c04ebd179 100644
--- a/spa/plugins/alsa/alsa-acp-device.c
+++ b/spa/plugins/alsa/alsa-acp-device.c
@@ -347,7 +347,7 @@ static struct spa_pod *build_route(struct spa_pod_builder *b, uint32_t id,
 		SPA_PARAM_ROUTE_priority,  SPA_POD_Int(p->priority),
 		SPA_PARAM_ROUTE_available,  SPA_POD_Id(p->available),
 		0);
-	spa_pod_builder_prop(b, SPA_PARAM_ROUTE_info, 0);
+	spa_pod_builder_prop(b, SPA_PARAM_ROUTE_info, SPA_POD_PROP_FLAG_HINT_DICT);
 	spa_pod_builder_push_struct(b, &f[1]);
 	spa_pod_builder_int(b, p->props.n_items);
 	acp_dict_for_each(item, &p->props) {