diff --git a/phpBB/adm/style/ajax.js b/phpBB/adm/style/ajax.js
index 28f761bc0b..d5154b2a61 100644
--- a/phpBB/adm/style/ajax.js
+++ b/phpBB/adm/style/ajax.js
@@ -87,7 +87,7 @@ phpbb.prepareSendStats = function () {
 		$.ajax({
 			url: $this.attr('data-ajax-action').replace('&', '&'),
 			type: 'POST',
-			data: 'systemdata=' + $this.find('input[name=systemdata]').val(),
+			data: 'systemdata=' + encodeURIComponent($this.find('input[name=systemdata]').val()),
 			success: returnHandler,
 			error: errorHandler,
 			cache: false