diff --git a/src/vapi/mpv.vapi b/src/vapi/mpv.vapi
index 635e647..109d55c 100644
--- a/src/vapi/mpv.vapi
+++ b/src/vapi/mpv.vapi
@@ -109,6 +109,9 @@ namespace Mpv {
         PROPERTY_CHANGE,
         QUEUE_OVERFLOW,
         HOOK,
+
+        [CCode (cname = "mpv_event_name")]
+        public unowned string to_string ();
     }
 
     [CCode (cname = "mpv_event", destroy_function = "", has_type_id = false, has_copy_function = false)]