diff --git a/src/main/scala/diplomacy/LazyModule.scala b/src/main/scala/diplomacy/LazyModule.scala
index 1a98b660..972963c5 100644
--- a/src/main/scala/diplomacy/LazyModule.scala
+++ b/src/main/scala/diplomacy/LazyModule.scala
@@ -86,7 +86,7 @@ abstract class LazyModule()(implicit val p: Parameters)
     buf ++= s"""${pad}  <graph id=\"${index}::\" edgedefault=\"directed\">\n"""
     nodes.filter(!_.omitGraphML).foreach { n =>
       buf ++= s"""${pad}    <node id=\"${index}::${n.index}\">\n"""
-      buf ++= s"""${pad}      <data key=\"d\">${n.nodedebugstring}</data>\n"""
+      buf ++= s"""${pad}      <data key=\"d\"><y:ShapeNode><y:Shape type="ellipse"/></y:ShapeNode>${n.nodedebugstring}</data>\n"""
       buf ++= s"""${pad}    </node>\n"""
     }
     children.filter(!_.omitGraphML).foreach { _.nodesGraphML(buf, pad + "    ") }