diff --git a/templates/invoice.tex.erb b/templates/invoice.tex.erb
index cdc2692..38f6fb4 100644
--- a/templates/invoice.tex.erb
+++ b/templates/invoice.tex.erb
@@ -1,4 +1,4 @@
-\documentclass[a4paper,12pt,oneside,dutch]{isodoc}
+\documentclass[a4paper,oneside,dutch]{isodoc}
 
 % rubber: clean <%= @number %>.out