diff --git a/crates/ptth_server/src/file_server.rs b/crates/ptth_server/src/file_server.rs
index 3c13674..8b1d873 100644
--- a/crates/ptth_server/src/file_server.rs
+++ b/crates/ptth_server/src/file_server.rs
@@ -220,6 +220,9 @@ async fn serve_file (
 	if uri.ends_with (".js") {
 		response.header ("content-type".into (), b"application/javascript".to_vec ());
 	}
+	else if uri.ends_with (".html") {
+		response.header ("content-type".into (), b"text/html; charset=UTF-8".to_vec ());
+	}
 	
 	response.header ("content-length".into (), content_length.to_string ().into_bytes ());