diff --git a/tinyphone/server.h b/tinyphone/server.h
index 045a926..8f57231 100644
--- a/tinyphone/server.h
+++ b/tinyphone/server.h
@@ -69,6 +69,7 @@ struct TinyPhoneMiddleware
 			res.add_header("Access-Control-Allow-Origin", "*");
 			res.add_header("Access-Control-Allow-Methods", "OPTIONS, GET, HEAD, POST, PUT, DELETE");
 			res.add_header("Access-Control-Request-Headers", "Content-Type");
+			res.add_header("Access-Control-Allow-Headers", "Content-Type");
 			res.end();
 		}
 	}