diff --git a/src/server.ts b/src/server.ts
index 19ccbdc..0f05520 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -28,7 +28,7 @@ export function createApp(config: AppConfig, stampManager: StampManager): Applic
         res.set('Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
         res.set(
             'Access-Control-Allow-Headers',
-            'Content-Type, Authorization, swarm-postage-batch-id, swarm-postage-stamp, swarm-deferred-upload, swarm-encrypt'
+            'Content-Type, Authorization, swarm-postage-batch-id, swarm-postage-stamp, swarm-deferred-upload, swarm-encrypt, swarm-collection'
         )
 
         if (req.method === 'OPTIONS') {