diff --git a/src/Bundle/ChillEventBundle/Form/Type/PickEventType.php b/src/Bundle/ChillEventBundle/Form/Type/PickEventType.php
index 6b0b2d1ab..68500e55e 100644
--- a/src/Bundle/ChillEventBundle/Form/Type/PickEventType.php
+++ b/src/Bundle/ChillEventBundle/Form/Type/PickEventType.php
@@ -151,7 +151,7 @@ class PickEventType extends AbstractType
         } else {
             $centers = $this->authorizationHelper->getReachableCenters(
                 $this->user,
-                $options['role']
+                (string) $options['role']
             );
         }