diff --git a/vapi/gobject-2.0.vapi b/vapi/gobject-2.0.vapi
index bf5b6d7..94aa99f 100644
--- a/vapi/gobject-2.0.vapi
+++ b/vapi/gobject-2.0.vapi
@@ -314,6 +314,7 @@ namespace GLib {
 		public weak GLib.Object target { get; }
 		public string target_property { get; }
 		public GLib.BindingFlags flags { get; }
+		public void unbind();
 	}
 
 	[CCode (has_target = false)]
