diff --git a/commerce_popular_products.module b/commerce_popular_products.module
index 345d7abab7797d1e421e4cbe6f9bdce519df89c6..798adf9aaf8abd1eab3b208f6c22c282ee4a9004 100644
--- a/commerce_popular_products.module
+++ b/commerce_popular_products.module
@@ -134,7 +134,7 @@ function commerce_popular_products_block_view($delta = '') {
   $block = array();
   switch ($delta) {
     case 'popular-product-block':
-      $block['subject'] = variable_get('commerce_popular_products_title');
+      $block['subject'] = check_plain(variable_get('commerce_popular_products_title'));
       $block['content'] = commerce_popular_products_get_content();
       break;