diff --git a/Makefile b/Makefile
index e6cf913..61fab81 100644
--- a/Makefile
+++ b/Makefile
@@ -5,13 +5,13 @@ book-a4.pdf: book.md
 	    --toc-depth 2                \
 	    --number-sections            \
 	    --highlight-style zenburn    \
-	    -V documentclass:article     \
-	    -V papersize:a4              \
+	    -V documentclass:extarticle  \
+	    -V papersize:A4              \
 	    -V fontsize:14pt             \
 	    -V geometry:"top=2.5cm,      \
 	                 bottom=2.6cm,   \
-	                 left=2.8cm,     \
-	                 right=2.8cm"    \
+	                 left=2.5cm,     \
+	                 right=2.5cm"    \
 	    $< -o $@
 
 book-a4.ps: book-a4.pdf