diff --git a/app/messages/api/webhook/incoming-message.ts b/app/messages/api/webhook/incoming-message.ts
index ad2e96b..442cfde 100644
--- a/app/messages/api/webhook/incoming-message.ts
+++ b/app/messages/api/webhook/incoming-message.ts
@@ -71,7 +71,8 @@ export default async function incomingMessageHandler(req: BlitzApiRequest, res:
 		if (phoneNumbersWithActiveSub.length === 0) {
 			// accept the webhook but don't store incoming message
 			// because the organization is on the free plan
-			res.status(200).end();
+			res.setHeader("content-type", "text/html");
+			res.status(200).send("<Response></Response>");
 			return;
 		}