diff --git a/inc/MicroBitMessageBus.h b/inc/MicroBitMessageBus.h
index fdace6a..a31e7fb 100644
--- a/inc/MicroBitMessageBus.h
+++ b/inc/MicroBitMessageBus.h
@@ -177,7 +177,7 @@ class MicroBitMessageBus : public MicroBitComponent
       * uBit.MessageBus.ignore(MICROBIT_ID_BUTTON_B, MICROBIT_BUTTON_EVT_CLICK, onButtonBClick); 
       * @endcode
 	  */
-	void ignore(int id, int value, void (*handler)(MicroBitEvent, void*), void* arg);
+	void ignore(int id, int value, void (*handler)(MicroBitEvent, void*));
 
 	/**
 	  * Unregister a listener function.
diff --git a/source/MicroBitMessageBus.cpp b/source/MicroBitMessageBus.cpp
index 3d7b999..be5c1ff 100644
--- a/source/MicroBitMessageBus.cpp
+++ b/source/MicroBitMessageBus.cpp
@@ -341,12 +341,13 @@ void MicroBitMessageBus::ignore(int id, int value, void (*handler)(MicroBitEvent
  * uBit.MessageBus.ignore(MICROBIT_ID_BUTTON_B, MICROBIT_BUTTON_EVT_CLICK, onButtonBClick); 
  * @endcode
  */
-void MicroBitMessageBus::ignore(int id, int value, void (*handler)(MicroBitEvent, void*), void* arg)
+void MicroBitMessageBus::ignore(int id, int value, void (*handler)(MicroBitEvent, void*))
 {
 	if (handler == NULL)
 		return;
 
-	MicroBitListener listener(id, value, handler, arg);
+    // The remove function is not comparing the [arg] anyhow.
+	MicroBitListener listener(id, value, handler, NULL);
     remove(&listener);
 }