diff --git a/lib/grade/grade_category.php b/lib/grade/grade_category.php
index a707521491e..5fcb5b77d86 100644
--- a/lib/grade/grade_category.php
+++ b/lib/grade/grade_category.php
@@ -728,9 +728,9 @@ class grade_category extends grade_object {
                 continue;
             }
             if ($item->gradetype == GRADE_TYPE_VALUE) {
-                $maxes[] = $item->grademax;
+                $maxes[$item->id] = $item->grademax;
             } else if ($item->gradetype == GRADE_TYPE_SCALE) {
-                $maxes[] = $item->grademax; // 0 = nograde, 1 = first scale item, 2 = second scale item
+                $maxes[$item->id] = $item->grademax; // 0 = nograde, 1 = first scale item, 2 = second scale item
             }
         }
         // apply droplow and keephigh