diff --git a/dev-ruby/rgl/rgl-0.6.6.ebuild b/dev-ruby/rgl/rgl-0.6.6.ebuild
index 71bbdcbe177d8..567e7e9b3c035 100644
--- a/dev-ruby/rgl/rgl-0.6.6.ebuild
+++ b/dev-ruby/rgl/rgl-0.6.6.ebuild
@@ -18,6 +18,8 @@ SLOT="0"
 KEYWORDS="~amd64"
 IUSE=""
 
+DEPEND+=" test? ( media-gfx/graphviz )"
+
 ruby_add_rdepend "
 	dev-ruby/pairing_heap:0
 	>=dev-ruby/rexml-3.2.4:3