diff --git a/mod/glossary/editcategories.php b/mod/glossary/editcategories.php
index da00f5eb832..cc360e597e8 100644
--- a/mod/glossary/editcategories.php
+++ b/mod/glossary/editcategories.php
@@ -14,6 +14,8 @@
 
     optional_variable($name);  // confirm the action
 
+    $name = clean_text($name);
+
     $action = strip_tags(urldecode($action));  //XSS
     $hook = strip_tags(urldecode($hook));  //XSS
     $mode = strip_tags(urldecode($mode));  //XSS