diff --git a/Makefile b/Makefile
index 0f13485..572e6d6 100644
--- a/Makefile
+++ b/Makefile
@@ -53,3 +53,4 @@ archivemail.1: archivemail.sgml
 archivemail.html: archivemail.sgml db2html.dsl
 	docbook2html --dsl db2html.dsl -u archivemail.sgml
 	chmod 644 archivemail.html
+	tidy -modify -indent -f /dev/null archivemail.html || true