diff --git a/sudoku.js b/sudoku.js
index 169631f..73e5b13 100755
--- a/sudoku.js
+++ b/sudoku.js
@@ -82,10 +82,6 @@ window.onload = function() {
     }
 
     loadGame(history.state)
-
-    if ("serviceWorker" in navigator) {
-        navigator.serviceWorker.register(`service-worker.js`)
-    }
 }
 
 window.onpopstate = (event) => loadGame(event.state)
diff --git a/sudoku.php b/sudoku.php
index a5ae474..f46d4fc 100755
--- a/sudoku.php
+++ b/sudoku.php
@@ -94,6 +94,7 @@
         <ul id='contextMenu' class='context-menu modal-content shadow list-group w-auto position-absolute'></ul>
         <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ENjdO4Dr2bkBIFxQpeoTz1HIcje39Wm4jDKdf19U8gI4ddQ3GYNS7NTKfAdVQSZe" crossorigin="anonymous"></script>
         <script src='sudoku.js' defer></script>
+        <script>navigator?.serviceWorker.register('service-worker.js')</script>
     </body>
 
 </html>
\ No newline at end of file