diff --git a/src/middleware/nnas-basic-header-check.ts b/src/middleware/nnas-basic-header-check.ts
index 400e6db..c6c67c5 100644
--- a/src/middleware/nnas-basic-header-check.ts
+++ b/src/middleware/nnas-basic-header-check.ts
@@ -135,7 +135,7 @@ function nnasBasicHeaderCheckMiddleware(request: express.Request, response: expr
 			errors: {
 				error: {
 					code: '0002',
-					message: 'X-Nintendo-Region format is invalid'
+					message: 'X-Nintendo-Country format is invalid'
 				}
 			}
 		}).end());