diff --git a/admin/plugin.php b/admin/plugin.php
index 68e0c50d7..16de979a5 100644
--- a/admin/plugin.php
+++ b/admin/plugin.php
@@ -63,6 +63,6 @@ if (is_file($filename))
 }
 else
 {
-  die('Missing file '.$filename);
+  die('Missing file '.htmlentities($filename));
 }
 ?>
\ No newline at end of file