diff --git a/src/apps/haiku-depot/textview/TextListener.cpp b/src/apps/haiku-depot/textview/TextListener.cpp
index 4819b5ff11..d6054b4c55 100644
--- a/src/apps/haiku-depot/textview/TextListener.cpp
+++ b/src/apps/haiku-depot/textview/TextListener.cpp
@@ -106,6 +106,6 @@ TextListener::TextChanging(TextChangingEvent& event)
 
 
 void
-TextListener::TextChanged(TextChangedEvent& event)
+TextListener::TextChanged(const TextChangedEvent& event)
 {
 }
diff --git a/src/apps/haiku-depot/textview/TextListener.h b/src/apps/haiku-depot/textview/TextListener.h
index a3f8993b40..5f8a41d929 100644
--- a/src/apps/haiku-depot/textview/TextListener.h
+++ b/src/apps/haiku-depot/textview/TextListener.h
@@ -64,8 +64,11 @@ public:
 
 	virtual	void				TextChanging(TextChangingEvent& event);
 
-	virtual	void				TextChanged(TextChangedEvent& event);
+	virtual	void				TextChanged(const TextChangedEvent& event);
 };
 
 
+typedef BReference<TextListener> TextListenerRef;
+
+
 #endif // TEXT_LISTENER_H