diff --git a/includes/database/query.inc b/includes/database/query.inc
index 612985e..e8f6c24 100644
--- a/includes/database/query.inc
+++ b/includes/database/query.inc
@@ -1602,8 +1602,7 @@ class MergeQuery extends Query implements QueryConditionInterface {
         throw new InvalidMergeQueryException(t('Invalid merge query: no conditions'));
       }
       $select = $this->connection->select($this->conditionTable)
-        ->condition($this->condition)
-        ->forUpdate();
+        ->condition($this->condition);
       $select->addExpression('1');
       if (!$select->execute()->fetchField()) {
         try {