diff --git a/Makefile b/Makefile
index cde323f..7e8915a 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ ps: dvi
 	dvips $(DVIFILE)
 
 pdf: dvi
-	dvipdf -ta4 $(DVIFILE)
+	dvipdf -sPAPERSIZE=a4 $(DVIFILE)
 
 booklet: ps
 	./ps2book.sh $(PSFILE)