diff --git a/js/html_actuator.js b/js/html_actuator.js
index 150f0b108ecc5e5a8947df4df3b7ebd420e0c985..8290f0d4e6ece7bdfcc84008742f91e8068ab054 100644
--- a/js/html_actuator.js
+++ b/js/html_actuator.js
@@ -123,5 +123,7 @@ HTMLActuator.prototype.message = function (won) {
 };
 
 HTMLActuator.prototype.clearMessage = function () {
-  this.messageContainer.classList.remove("game-won", "game-over");
+  // IE only takes one value to remove at a time.
+  this.messageContainer.classList.remove("game-won");
+  this.messageContainer.classList.remove("game-over");
 };