diff --git a/pills/18-nix-store-paths.xml b/pills/18-nix-store-paths.xml
index 82f1e8c..370749e 100644
--- a/pills/18-nix-store-paths.xml
+++ b/pills/18-nix-store-paths.xml
@@ -27,7 +27,7 @@
     <para>
       Now inspect the .drv to see where is <filename>./myfile</filename> being stored:
     </para>
-    <xi:include href="./18/derivation-simple-contents.xml" />
+    <xi:include href="./18/derivation-simple-content.xml" />
     <para>
       Great, how did nix decide to use <literal>xv2iccirbrvklck36f1g7vldn5v58vck</literal> ? Keep looking at the nix comments.
     </para>