diff --git a/build_support/boot_textarea.js b/build_support/boot_textarea.js
index 028f34b2..96cca854 100644
--- a/build_support/boot_textarea.js
+++ b/build_support/boot_textarea.js
@@ -425,6 +425,7 @@ function setupSettingPanel(settingDiv, settingOpener, api, options) {
             clojure:    "Clojure",
             ocaml:      "OCaml",
             csharp:     "C#",
+            haxe:       "haXe",
             svg:        "SVG",
             textile:    "Textile",
             groovy:     "Groovy",