diff --git a/d2layouts/d2dagrelayout/layout.go b/d2layouts/d2dagrelayout/layout.go
index 6d2a5f91b..a6cb68e84 100644
--- a/d2layouts/d2dagrelayout/layout.go
+++ b/d2layouts/d2dagrelayout/layout.go
@@ -31,8 +31,8 @@ var setupJS string
 var dagreJS string
 
 type ConfigurableOpts struct {
-	NodeSep int
-	EdgeSep int
+	NodeSep int `json:"nodesep"`
+	EdgeSep int `json:"edgesep"`
 }
 
 var DefaultOpts = ConfigurableOpts{