diff --git a/course/classes/reportbuilder/local/entities/completion.php b/course/classes/reportbuilder/local/entities/completion.php
index efcad9248bb..d8201a2fd54 100644
--- a/course/classes/reportbuilder/local/entities/completion.php
+++ b/course/classes/reportbuilder/local/entities/completion.php
@@ -226,11 +226,11 @@ class completion extends base {
                 LEFT JOIN {grade_grades} {$grade}
                        ON ({$user}.id = {$grade}.userid AND {$gradeitem}.id = {$grade}.itemid)
             ")
-            ->set_type(column::TYPE_INTEGER)
+            ->set_type(column::TYPE_FLOAT)
             ->add_fields("{$grade}.finalgrade")
             ->set_is_sortable(true)
-            ->add_callback(function ($value) {
-                if (!$value) {
+            ->add_callback(function(?float $value): string {
+                if ($value === null) {
                     return '';
                 }
                 return format_float($value, 2);
diff --git a/course/tests/reportbuilder/datasource/participants_test.php b/course/tests/reportbuilder/datasource/participants_test.php
index 25025ae0191..3c9c1abf9cc 100644
--- a/course/tests/reportbuilder/datasource/participants_test.php
+++ b/course/tests/reportbuilder/datasource/participants_test.php
@@ -80,7 +80,7 @@ class participants_test extends core_reportbuilder_testcase {
 
         // Update final grade for the user.
         $courseitem = grade_item::fetch_course_item($course->id);
-        $courseitem->update_final_grade($user1->id, 80);
+        $courseitem->update_final_grade($user1->id, 42.5);
 
         // Set some last access value for the user in the course.
         $DB->insert_record('user_lastaccess',
@@ -152,7 +152,7 @@ class participants_test extends core_reportbuilder_testcase {
             '', // Reagreggate.
             '2', // Days taking course.
             '2', // Days until completion.
-            '80.00', // Grade.
+            '42.50', // Grade.
         ], array_values($content[0]));
     }