diff --git a/src/main.vala b/src/main.vala
index a70194f..a81ce42 100644
--- a/src/main.vala
+++ b/src/main.vala
@@ -38,6 +38,13 @@ public class PluginObjectExample : PluginObject {
 		stdout.printf ("cache dir = %s\n", cache_dir);
 		return _("Protocol Object Example");
 	}
+
+	/**
+	 * Compose the object.
+	 */
+	public override void compose () throws Error {
+	}
+
 }
 
 [ModuleInit]