diff --git a/gpl-lgpl.tex b/gpl-lgpl.tex
index 892870d..f689dfd 100644
--- a/gpl-lgpl.tex
+++ b/gpl-lgpl.tex
@@ -6,7 +6,7 @@
 % Verbatim copying and distribution of this entire document is permitted in
 % any medium, provided this notice is preserved.
 
-\documentclass[11pt]{book}
+\documentclass[11pt, letterpaper]{book}
 % FILTER_PS:  \input{generate-ps-file}
 % FILTER_PDF: \input{generate-pdf-file}
 % FILTER_HTML: \input{generate-html-file}