diff --git a/main/exercice/export/qti2/qti2_classes.php b/main/exercice/export/qti2/qti2_classes.php
index 1b374e9429..e7e8f27216 100755
--- a/main/exercice/export/qti2/qti2_classes.php
+++ b/main/exercice/export/qti2/qti2_classes.php
@@ -22,6 +22,7 @@ define('FREE_ANSWER', 		5);
 define('HOTSPOT',			6);
 
 require_once(api_get_path(SYS_CODE_PATH).'/exercice/answer.class.php');
+require_once(api_get_path(SYS_CODE_PATH).'/exercice/exercise.class.php');
 require_once(api_get_path(SYS_CODE_PATH).'/exercice/hotspot.class.php');
 require_once(api_get_path(SYS_CODE_PATH).'/exercice/unique_answer.class.php');
 require_once(api_get_path(SYS_CODE_PATH).'/exercice/multiple_answer.class.php');