diff --git a/ui/controls.js b/ui/controls.js
index db3f3222c0..a674614793 100644
--- a/ui/controls.js
+++ b/ui/controls.js
@@ -1192,7 +1192,7 @@ shaka.ui.Controls = class extends shaka.util.FakeEventTarget {
       // The controls are hidden, so show them.
       this.onMouseMove_(event);
       // Stop this event from becoming a click event.
-      event.preventDefault();
+      event.cancelable && event.preventDefault();
     }
   }