diff --git a/app/api_topologies.go b/app/api_topologies.go
index fb3e30170..21dee103d 100644
--- a/app/api_topologies.go
+++ b/app/api_topologies.go
@@ -362,7 +362,7 @@ func (a byName) Less(i, j int) bool { return a[i].Name < a[j].Name }
 type APITopologyOptionGroup struct {
 	ID string `json:"id"`
 	// Default value for the UI to adopt. NOT used as the default if the value is omitted, allowing "" as a distinct value.
-	Default string              `json:"defaultValue,omitempty"`
+	Default string              `json:"defaultValue"`
 	Options []APITopologyOption `json:"options,omitempty"`
 	// SelectType describes how options can be picked. Currently defined values:
 	//   "one": Default if empty. Exactly one option may be picked from the list.