diff --git a/packages/designer/src/document/document-model.ts b/packages/designer/src/document/document-model.ts
index e9a00e676..4a34213f3 100644
--- a/packages/designer/src/document/document-model.ts
+++ b/packages/designer/src/document/document-model.ts
@@ -86,7 +86,7 @@ export class DocumentModel {
   }
 
   get fileName(): string {
-    return this.rootNode?.getExtraProp('fileName')?.getAsString() || this.id;
+    return this.rootNode?.getExtraProp('fileName', false)?.getAsString() || this.id;
   }
 
   set fileName(fileName: string) {