diff --git a/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php b/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php
index 567e678e1..0f78ee2bb 100644
--- a/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php
+++ b/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php
@@ -653,13 +653,17 @@ class AccompanyingPeriod
 
     /**
      * Get a list of all persons which are participating to this course
+     *
+     * @psalm-return Collection<int, Person>
      */
     public function getPersons(): Collection
     {
-        return $this->participations->map(
-            function(AccompanyingPeriodParticipation $participation) {
-                return $participation->getPerson();
-            }
-        );
+        return $this
+            ->participations
+            ->map(
+                static function(AccompanyingPeriodParticipation $participation): Person {
+                    return $participation->getPerson();
+                }
+            );
     }
 }