diff --git a/src/Form/Model/BookingDto.php b/src/Form/Model/BookingDto.php
index 536f47b..5ddd6fe 100644
--- a/src/Form/Model/BookingDto.php
+++ b/src/Form/Model/BookingDto.php
@@ -379,10 +379,8 @@ class BookingDto
         }
 
         foreach ($this->participants as $participant) {
-            if ($participant instanceof ParticipantDto) {
-                // Temporary cleanup for older serialized participants restored from session.
-                $participant->normalizeBodyDimensions();
-            }
+            // Temporary cleanup for older serialized participants restored from session.
+            $participant->normalizeBodyDimensions();
         }
 
         // Old sessions (before c373a989) still carry a full Travel object;