diff --git a/SysBuild/tools/docbookx b/SysBuild/tools/docbookx
index ef01402..3b8e327 100644
--- a/SysBuild/tools/docbookx
+++ b/SysBuild/tools/docbookx
@@ -89,5 +89,6 @@ mk() {
 }
 
 postmk() {
-	echo "Nothing to do for postmk()"
+	sed -i "s%$TMPROOT%%" $TMPROOT/etc/xml/catalog
+	sed -i "s%$TMPROOT%%" $TMPROOT/etc/xml/docbook
 }