diff --git a/lib/grade/grade_category.php b/lib/grade/grade_category.php
index f26f8212d01..e89b7ea5b72 100644
--- a/lib/grade/grade_category.php
+++ b/lib/grade/grade_category.php
@@ -2249,14 +2249,11 @@ class grade_category extends grade_object {
         }
 
         //if marking category visible make sure parent category is visible MDL-21367
-        if( !$hidden ) {
+        if ($this->is_hidden() != $hidden) {
             $category_array = grade_category::fetch_all(array('id'=>$this->parent));
             if ($category_array && array_key_exists($this->parent, $category_array)) {
                 $category = $category_array[$this->parent];
-                //call set_hidden on the category regardless of whether it is hidden as its parent might be hidden
-                //if($category->is_hidden()) {
-                    $category->set_hidden($hidden, false);
-                //}
+                $category->set_hidden($hidden, false);
             }
         }
     }
diff --git a/lib/grade/grade_item.php b/lib/grade/grade_item.php
index 6fc05cfe434..d29761bd89d 100644
--- a/lib/grade/grade_item.php
+++ b/lib/grade/grade_item.php
@@ -608,14 +608,11 @@ class grade_item extends grade_object {
         }
 
         //if marking item visible make sure category is visible MDL-21367
-        if( !$hidden ) {
+        if ($this->is_hidden() != $hidden) {
             $category_array = grade_category::fetch_all(array('id'=>$this->categoryid));
             if ($category_array && array_key_exists($this->categoryid, $category_array)) {
                 $category = $category_array[$this->categoryid];
-                //call set_hidden on the category regardless of whether it is hidden as its parent might be hidden
-                //if($category->is_hidden()) {
-                    $category->set_hidden($hidden, false);
-                //}
+                $category->set_hidden($hidden, false);
             }
         }
     }