diff --git a/doc/sbase/dist/birddoc/latex2e/mapping b/doc/sbase/dist/birddoc/latex2e/mapping
index 161227d2..7653cb78 100644
--- a/doc/sbase/dist/birddoc/latex2e/mapping
+++ b/doc/sbase/dist/birddoc/latex2e/mapping
@@ -2,7 +2,7 @@
 % birddoc to LaTeX replacement file
 
 % The \relax is there to avoid sgml2latex rewriting the class
-<book>		+ "\\relax\\documentclass\[a4paper,10pt,openany\]{book}\n"
+<book>		+ "\\relax\\documentclass\[a4paper,10pt,openany,oneside\]{book}\n"
 			"\\usepackage\[colorlinks=true,linkcolor=blue,pdftitle={BIRD User's Guide}\]{hyperref}\n"
 			"\\usepackage{enumitem}\n"
 			"\\usepackage{birddoc}\n"