diff --git a/packages/ocamlgraph/ocamlgraph.2.0.0/opam b/packages/ocamlgraph/ocamlgraph.2.0.0/opam
index 9f9a3283740..fa680c20429 100644
--- a/packages/ocamlgraph/ocamlgraph.2.0.0/opam
+++ b/packages/ocamlgraph/ocamlgraph.2.0.0/opam
@@ -20,6 +20,7 @@ depends: [
   "ocaml"
   "stdlib-shims"
   "dune" {>= "2.0"}
+  "graphics" {with-test}
 ]
 build: [
   ["dune" "subst"] {pinned}