diff --git a/db/migrate/20191204030230_migrate_exercise_single_question_score.rb b/db/migrate/20191204030230_migrate_exercise_single_question_score.rb
index c71fea157..1238e25f1 100644
--- a/db/migrate/20191204030230_migrate_exercise_single_question_score.rb
+++ b/db/migrate/20191204030230_migrate_exercise_single_question_score.rb
@@ -17,7 +17,7 @@ class MigrateExerciseSingleQuestionScore < ActiveRecord::Migration[5.2]
         user_choice_position = answer.exercise_choice&.choice_position
         if user_choice_position && (user_choice_position.to_i == question.exercise_standard_answers.take&.exercise_choice_id.to_i)
           answer.update!(score: question.question_score)
-          score = exercise_user.score + question.question_score
+          score = exercise_user.score.to_f + question.question_score
           objective_score = exercise_user.objective_score + question.question_score
           exercise_user.update!(score: score, objective_score: objective_score)
         end