diff --git a/src/editor/ui/Project.js b/src/editor/ui/Project.js
index 1ac11d0f..f7f01d5e 100644
--- a/src/editor/ui/Project.js
+++ b/src/editor/ui/Project.js
@@ -125,7 +125,7 @@ export default class Project {
             ScratchJr.log('all thumbnails updated', ScratchJr.getTime(), 'sec');
 
             // Set to fullscreen mode once project has loaded if parameter is passed in
-            if (new URLSearchParams(window.location.search).get('fullscreen') === 'true') {
+            if (window.fullscreenMode) {
                 ScratchJr.enterFullScreen();
                 gn('full').remove();
             }