diff --git a/debian/control b/debian/control
index 422a704..230d46c 100644
--- a/debian/control
+++ b/debian/control
@@ -5,7 +5,7 @@ Maintainer: Nobuhiro Iwamatsu <iwamatsu@debian.org>
 Build-Depends: debhelper (>= 7.0.0), cmake (>= 2.6.3),
 	libbluetooth-dev [linux-any], libusb-1.0-0-dev,
 	pkg-config, doxygen, docbook-xml, docbook-xsl,
-	xsltproc, libxml2-utils
+	xsltproc, libxml2-utils, graphviz <!nodoc>
 Standards-Version: 3.9.8
 Homepage: http://sourceforge.net/projects/openobex/
 Vcs-Git: https://anonscm.debian.org/git/collab-maint/libopenobex.git