diff --git a/mod/workshop/locallib.php b/mod/workshop/locallib.php
index 20c579d98e8..d6706a48f6d 100644
--- a/mod/workshop/locallib.php
+++ b/mod/workshop/locallib.php
@@ -1547,8 +1547,11 @@ class workshop {
     public function assessing_allowed($userid) {
 
         if ($this->phase != self::PHASE_ASSESSMENT) {
-            // assessing is not allowed but in the assessment phase
-            return false;
+            // assessing is allowed in the assessment phase only, unless the user is a teacher
+            // providing additional assessment during the evaluation phase
+            if ($this->phase != self::PHASE_EVALUATION or !has_capability('mod/workshop:overridegrades', $this->context, $userid)) {
+                return false;
+            }
         }
 
         $now = time();