diff --git a/lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php b/lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php
index ae8a20656bc0..9b59c7f380c1 100644
--- a/lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php
+++ b/lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php
@@ -3190,6 +3190,7 @@ public function prepareSqlCondition($fieldName, $condition)
 
         $query = '';
         if (is_array($condition)) {
+            $condition = array_change_key_case($condition, CASE_LOWER);
             $key = key(array_intersect_key($condition, $conditionKeyMap));
 
             if (isset($condition['from']) || isset($condition['to'])) {