diff --git a/mod/assign/gradingtable.php b/mod/assign/gradingtable.php
index eeec2780bf2..c995acfcae1 100644
--- a/mod/assign/gradingtable.php
+++ b/mod/assign/gradingtable.php
@@ -198,7 +198,7 @@ class assign_grading_table extends table_sql implements renderable {
             } else if ($filter == ASSIGN_FILTER_REQUIRE_GRADING) {
                 $where .= ' AND (s.timemodified IS NOT NULL AND
                                  s.status = :submitted AND
-                                 (s.timemodified > g.timemodified OR g.timemodified IS NULL))';
+                                 (s.timemodified >= g.timemodified OR g.timemodified IS NULL))';
                 $params['submitted'] = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
 
             } else if (strpos($filter, ASSIGN_FILTER_SINGLE_USER) === 0) {
diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index effc0bfdfbd..6a9d791abf3 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -1518,7 +1518,7 @@ class assign {
                         s.assignment = :assignid AND
                         s.timemodified IS NOT NULL AND
                         s.status = :submitted AND
-                        (s.timemodified > g.timemodified OR g.timemodified IS NULL)';
+                        (s.timemodified >= g.timemodified OR g.timemodified IS NULL)';
 
         return $DB->count_records_sql($sql, $params);
     }