diff --git a/Documentation/Makefile b/Documentation/Makefile
index 7c1c9e1918..48d41c5729 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -106,7 +106,7 @@ user-manual.xml: user-manual.txt user-manual.conf
 	$(ASCIIDOC) -b docbook -d book $<
 
 XSLT = http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
-XSLTOPTS = --nonet --xinclude --stringparam html.stylesheet docbook-xsl.css
+XSLTOPTS = --xinclude --stringparam html.stylesheet docbook-xsl.css
 
 user-manual.html: user-manual.xml
 	xsltproc $(XSLTOPTS) -o $@ $(XSLT) $<