diff --git a/blocks/quiz_results/block_quiz_results.php b/blocks/quiz_results/block_quiz_results.php
index b4081ad1c84..36672d9f14c 100644
--- a/blocks/quiz_results/block_quiz_results.php
+++ b/blocks/quiz_results/block_quiz_results.php
@@ -49,7 +49,7 @@ class block_quiz_results extends block_base {
         }
 
         // Get the grades for this quiz
-        $grades = get_records('quiz_grades', 'quiz', $quizid, 'grade, timemodified DESC');
+        $grades = get_records('quiz_grades', 'quiz', $quizid, 'grade + 0, timemodified DESC');
 
         if(empty($grades)) {
             // No grades, sorry