diff --git a/src/hydra/fetchJsonLd.ts b/src/hydra/fetchJsonLd.ts
index 99be05c..c1407ec 100644
--- a/src/hydra/fetchJsonLd.ts
+++ b/src/hydra/fetchJsonLd.ts
@@ -62,7 +62,7 @@ export default async function fetchJsonLd(
 
 function setHeaders(options: RequestInitExtended): RequestInit {
   if (!options.headers) {
-    return { ...options, headers: {} };
+    options.headers = {};
   }
 
   let headers =