diff --git a/js/html_actuator.js b/js/html_actuator.js
index 94a8f3537f186ae3e3ec1c13fa48ff828cb202bb..fbef1e28e9197a06615133733ad31511cf0f9b3c 100644
--- a/js/html_actuator.js
+++ b/js/html_actuator.js
@@ -114,5 +114,7 @@ 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");
 };