diff --git a/ds/dict.c b/ds/dict.c
index 04e1235..9a49165 100644
--- a/ds/dict.c
+++ b/ds/dict.c
@@ -407,7 +407,7 @@ static void dict_fini(b_object *obj, void *priv)
 	}
 }
 
-static void dict_to_string(const b_object *obj, struct b_stream *out)
+static void dict_to_string(const b_object *obj, b_stream *out)
 {
 	struct b_dict_p *dict = b_object_get_private(obj, B_TYPE_DICT);