diff --git a/app/Migrations/Schema/V110/Version20151221150100.php b/app/Migrations/Schema/V110/Version20151221150100.php
index db9aeb051e..18492e3b2b 100644
--- a/app/Migrations/Schema/V110/Version20151221150100.php
+++ b/app/Migrations/Schema/V110/Version20151221150100.php
@@ -16,6 +16,9 @@ class Version20151221150100 extends AbstractMigrationChamilo
      */
     public function up(Schema $schema)
     {
+        $this->addSql(" 
+            ALTER TABLE c_quiz_answer ADD INDEX idx_quiz_qid (question_id)");
+
         $this->addSql("
             UPDATE track_e_attempt a
             INNER JOIN c_quiz_answer qa