diff --git a/src/Paperback/Paperback.ts b/src/Paperback/Paperback.ts
index 01bb241..7f50f7e 100644
--- a/src/Paperback/Paperback.ts
+++ b/src/Paperback/Paperback.ts
@@ -104,7 +104,9 @@ export class KomgaRequestInterceptor implements SourceInterceptor {
         // raising an error in getAuthorizationString when we check for its existence
         // Thus we only inject an authorizationString if none are defined in the request
         if (request.headers.authorization === undefined) {
-            request.headers.authorization = await getAuthorizationString(this.stateManager)
+            request.headers = {
+              'authorization': await getAuthorizationString(this.stateManager)
+            }
         }
         return request
     }