diff --git a/templates/protostar/offline.php b/templates/protostar/offline.php
index 182db80b70a42..66dfdccbe42b5 100644
--- a/templates/protostar/offline.php
+++ b/templates/protostar/offline.php
@@ -79,7 +79,7 @@
 
 if ($this->params->get('logoFile'))
 {
-	$logo = '<img src="' . JUri::root() . $this->params->get('logoFile') . '" alt="' . $sitename . '" />';
+	$logo = '<img src="' . htmlspecialchars(JUri::root() . $this->params->get('logoFile'), ENT_QUOTES, 'UTF-8') . '" alt="' . $sitename . '" />';
 }
 elseif ($this->params->get('sitetitle'))
 {