diff --git a/src/ColumnSortable/Sortable.php b/src/ColumnSortable/Sortable.php
index 39df209..cd7b8a5 100755
--- a/src/ColumnSortable/Sortable.php
+++ b/src/ColumnSortable/Sortable.php
@@ -127,7 +127,7 @@ private function parseSortParameters(array $sortParameters)
         }
 
         $direction = array_get($sortParameters, 'order', []);
-        if ( ! in_array($direction, ['asc', 'desc'])) {
+        if ( ! in_array(strtolower($direction), ['asc', 'desc'])) {
             $direction = Config::get('columnsortable.default_direction', 'asc');
         }