diff --git a/Neos.Neos/NodeTypes/Mixin/Site.yaml b/Neos.Neos/NodeTypes/Mixin/Site.yaml
index af00674d1c5..a282b7a5824 100644
--- a/Neos.Neos/NodeTypes/Mixin/Site.yaml
+++ b/Neos.Neos/NodeTypes/Mixin/Site.yaml
@@ -10,6 +10,7 @@
     'Neos.Neos:Document': true
   properties:
     uriPathSegment:
+      validation: null
       ui:
         inspector:
           hidden: true