diff --git a/application/core/Callbacks/CallbackListener.php b/application/core/Callbacks/CallbackListener.php
index dacadef4..c054f209 100644
--- a/application/core/Callbacks/CallbackListener.php
+++ b/application/core/Callbacks/CallbackListener.php
@@ -4,10 +4,14 @@ namespace ManiaControl\Callbacks;
 
 /**
  * Interface for CallbackListener
- * 
+ *
  * @author steeffeen & kremsy
  */
 interface CallbackListener {
+	/**
+	 * Constants
+	 */
+	const CALLBACKLISTENER_INTERFACE = __CLASS__;
 }
 
 ?>
diff --git a/application/core/Manialinks/ManialinkPageAnswerListener.php b/application/core/Manialinks/ManialinkPageAnswerListener.php
index 0bef7bfc..c9397fb5 100644
--- a/application/core/Manialinks/ManialinkPageAnswerListener.php
+++ b/application/core/Manialinks/ManialinkPageAnswerListener.php
@@ -8,6 +8,10 @@ namespace ManiaControl\Manialinks;
  * @author steeffeen & kremsy
  */
 interface ManialinkPageAnswerListener {
+	/**
+	 * Constants
+	 */
+	const MANIALINKPAGEANSWERLISTENER_INTERFACE = __CLASS__;
 }
 
 ?>