diff --git a/main/inc/lib/exercise.lib.php b/main/inc/lib/exercise.lib.php
index a739dde55f..4cb714c61c 100644
--- a/main/inc/lib/exercise.lib.php
+++ b/main/inc/lib/exercise.lib.php
@@ -89,6 +89,13 @@ class ExerciseLib
             $objAnswerTmp = new Answer($questionId);
             $nbrAnswers = $objAnswerTmp->selectNbrAnswers();
 
+            if ($answerType == FREE_ANSWER ||
+                $answerType == ORAL_EXPRESSION ||
+                $answerType == CALCULATED_ANSWER
+            ) {
+                $nbrAnswers = 1;
+            }
+
             $quiz_question_options = Question::readQuestionOption(
                 $questionId,
                 $course_id