diff --git a/src/TextForEvent.js b/src/TextForEvent.js
index b3931485d8..a987e388c6 100644
--- a/src/TextForEvent.js
+++ b/src/TextForEvent.js
@@ -59,7 +59,7 @@ var handlers = {
 };
 
 module.exports = {
-    textForEvent(ev) {
+    textForEvent: function(ev) {
         var hdlr = handlers[ev.getType()];
         if (!hdlr) return "";
         return hdlr(ev);