diff --git a/course/lib.php b/course/lib.php
index b7e153a76a38..a3747614cf57 100644
--- a/course/lib.php
+++ b/course/lib.php
@@ -3251,6 +3251,14 @@ function duplicate_module($course, $cm, int $sectionid = null, bool $changename
             $DB->insert_record('role_capabilities', $override);
         }
 
+        // Copy locally assigned roles to new course module.
+        $overrides = $DB->get_records('role_assignments', ['contextid' => $cmcontext->id]);
+        foreach ($overrides as $override) {
+            $override->contextid = $newcmcontext->id;
+            unset($override->id);
+            $DB->insert_record('role_assignments', $override);
+        }
+
         // Trigger course module created event. We can trigger the event only if we know the newcmid.
         $newcm = get_fast_modinfo($cm->course)->get_cm($newcmid);
         $event = \core\event\course_module_created::create_from_cm($newcm);