diff --git a/os/emscripten/shell.html b/os/emscripten/shell.html
index 33bb850964..1879a92243 100644
--- a/os/emscripten/shell.html
+++ b/os/emscripten/shell.html
@@ -177,7 +177,7 @@
           document.getElementById("title").innerHTML = "Thank you for playing!";
           document.getElementById("message").innerHTML = "We hope you enjoyed OpenTTD!<br/><br/>Reload your browser to restart the game.";
 
-          window.close('','_parent','');
+          FS.syncfs(false, function (err) { window.close('','_parent',''); });
         },
 
         onAbort: function() {