diff --git a/packages/tre/src/plugins/r2/errors.ts b/packages/tre/src/plugins/r2/errors.ts
index 77d1fe10f..42cd45ea9 100644
--- a/packages/tre/src/plugins/r2/errors.ts
+++ b/packages/tre/src/plugins/r2/errors.ts
@@ -24,12 +24,10 @@ enum CfCode {
 }
 
 export class R2Error extends HttpError {
-  v4Code: number;
   object?: R2Object;
 
-  constructor(status: number, message: string, v4Code: number) {
-    super(status, message);
-    this.v4Code = v4Code;
+  constructor(code: number, message: string, readonly v4Code: number) {
+    super(code, message);
   }
 
   toResponse() {