diff --git a/src/app/service-graph/interfaces.ts b/src/app/service-graph/interfaces.ts
index 861ba75..4f2e470 100644
--- a/src/app/service-graph/interfaces.ts
+++ b/src/app/service-graph/interfaces.ts
@@ -22,7 +22,7 @@
 
 export interface IXosSgNode extends Id3Element {
   id: string;
-  data: any; // this can be a Service, ServiceInstance or Instance
+  data: IXosBaseModel; // this can be a Service, ServiceInstance or Instance
 
   // do we need those?
   type: string;