diff --git a/Grid/Source/Entity.php b/Grid/Source/Entity.php
index 6d5a606e..78cc0f99 100644
--- a/Grid/Source/Entity.php
+++ b/Grid/Source/Entity.php
@@ -365,10 +365,10 @@ public function initQueryBuilder(QueryBuilder $queryBuilder)
      */
     protected function getQueryBuilder()
     {
-        //If a custom QB has been provided, use that
+        //If a custom QB has been provided, use a copy of that one
         //Otherwise create our own basic one
         if ($this->queryBuilder instanceof QueryBuilder) {
-            $qb = $this->queryBuilder;
+            $qb = clone $this->queryBuilder;
         } else {
             $qb = $this->manager->createQueryBuilder($this->class);
             $qb->from($this->class, $this->getTableAlias());