diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Librus.java b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Librus.java
index ff04e59e..860219a7 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Librus.java
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Librus.java
@@ -1936,7 +1936,7 @@ public class Librus implements EdziennikInterface {
             return;
         }
         // not a full sync. Will get all grade categories. Clear the current list.
-        gradeCategoryList.clear();
+        //gradeCategoryList.clear();
 
         callback.onActionStarted(R.string.sync_action_syncing_grade_categories);
         apiRequest("Grades/Categories", data -> {