diff --git a/functions/api/rtbf.ts b/functions/api/rtbf.ts
index 943f4d5..c1cf375 100644
--- a/functions/api/rtbf.ts
+++ b/functions/api/rtbf.ts
@@ -10,7 +10,7 @@ export async function onRequestPost(context: RequestContext) {
 
   const sigHeader = context.request.headers.get("roblox-signature");
 
-  if (!sigHeader) return jsonError("Missing signature", 401);
+  if (!sigHeader) return jsonError("Missing signature header", 400);
 
   const [timestamp, sig] = sigHeader.split(",");
 
@@ -20,6 +20,8 @@ export async function onRequestPost(context: RequestContext) {
   )
     return jsonError("This request is stale", 406);
 
+  if (!sig) return jsonError("Missing signature value", 401);
+
   const textEncode = (text: string) => new TextEncoder().encode(text);
   const key = await crypto.subtle.importKey(
     "raw",