diff --git a/chapter04.rst b/chapter04.rst
index 713be56..017623e 100644
--- a/chapter04.rst
+++ b/chapter04.rst
@@ -1613,4 +1613,4 @@ stored in a relational database. This allows a clean separation of data and logi
 The next chapter `Chapter 5`_ covers the tools Django gives you to
 interact with a database.
 
-.. _Chapter 5: chapter05.html
+.. _Chapter 5: chapter05.rst