diff --git a/physics/templates/physics/exam_take.html b/physics/templates/physics/exam_take.html
index b8e60835..610218a3 100755
--- a/physics/templates/physics/exam_take.html
+++ b/physics/templates/physics/exam_take.html
@@ -104,7 +104,7 @@
                 {{question.get_answers_js}}.forEach((el, n) => {
                     console.log(el)
                     if (el) {
-                    $("ol.physics-answer-list li")[n].addClass("correct")
+                    $(`ol.physics-answer-list li:eq(${n})`).addClass("correct")
                     }
 
                 });