diff --git a/doc/SystemTap_Tapset_Reference/Makefile.am b/doc/SystemTap_Tapset_Reference/Makefile.am
index 9e7d206..efd627c 100644
--- a/doc/SystemTap_Tapset_Reference/Makefile.am
+++ b/doc/SystemTap_Tapset_Reference/Makefile.am
@@ -33,7 +33,9 @@ stamp-htmldocs: tapsets.xml
 	touch stamp-htmldocs
 
 tapsets.pdf: tapsets.xml
-	xmlto pdf tapsets.xml
+#	xmlto pdf tapsets.xml
+	xmlto fo tapsets.xml
+	fop tapsets.fo tapsets.pdf
 
 stamp-mandocs: tapsets.xml
 	xmlto man -o man5 tapsets.xml