diff --git a/chapter04/m4.xml b/chapter04/m4.xml
index fc816c87a..efe30852d 100644
--- a/chapter04/m4.xml
+++ b/chapter04/m4.xml
@@ -1,2 +1,2 @@
 M4 (&m4-version;) - &m4-size;:
-<ulink url="http://freshmeat.net/projects/m4/"/>
+<ulink url="http://freshmeat.net/projects/gnum4/"/>