diff --git a/src/main/Api.js b/src/main/Api.js
index 8f384b5..d787f1a 100644
--- a/src/main/Api.js
+++ b/src/main/Api.js
@@ -25,6 +25,6 @@ var postal = {
     },
 
     addWireTap: function(callback) {
-        this.configuration.bus.addWireTap(callback);
+        return this.configuration.bus.addWireTap(callback);
     }
 };