diff --git a/source/Ox.UI/js/Core/Fullscreen.js b/source/Ox.UI/js/Core/Fullscreen.js
index 40b4c867..def13612 100644
--- a/source/Ox.UI/js/Core/Fullscreen.js
+++ b/source/Ox.UI/js/Core/Fullscreen.js
@@ -109,7 +109,7 @@ Ox.Fullscreen = (function() {
         if (document.exitFullscreen) {
             document.exitFullscreen();
         } else if (document.mozCancelFullScreen) {
-            document.mozCancelFullscreen();
+            document.mozCancelFullScreen();
         } else if (document.webkitExitFullscreen) {
             document.webkitExitFullscreen()
         }