diff --git a/packages/ui-default/pages/problem_edit.page.js b/packages/ui-default/pages/problem_edit.page.js
index 49aef70be..52f1c1430 100644
--- a/packages/ui-default/pages/problem_edit.page.js
+++ b/packages/ui-default/pages/problem_edit.page.js
@@ -130,7 +130,7 @@ function buildCategoryFilter() {
       _.forEach(treeItem.children, (treeSubItem, subcategory) => {
         if (treeSubItem.select) {
           treeSubItem.select = false;
-          dirtyCategories.push({ type: 'subcategory', subcategory, category });
+          dirtyCategories.push({ type: 'subcategory', subcategory, category: tag });
         }
       });
     }