diff --git a/js/html_actuator.js b/js/html_actuator.js
index 374a9ee9dd7ad966fe3f516806be9045e1774db7..b05c477868d11ea51c283616de8cccc0a2b8f8c1 100644
--- a/js/html_actuator.js
+++ b/js/html_actuator.js
@@ -135,7 +135,9 @@ 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");
 };
 
 HTMLActuator.prototype.scoreTweetButton = function () {