diff --git a/src/sakia/data/entities/identity.py b/src/sakia/data/entities/identity.py
index d42b341088ef16b4c1282d7cd649bb8debb63fca..8ef5cc08b6dadb7a8a0de416db61b72d9259496e 100644
--- a/src/sakia/data/entities/identity.py
+++ b/src/sakia/data/entities/identity.py
@@ -25,6 +25,7 @@ class Identity:
         converter=block_uid, default=BlockUID.empty(), cmp=False, hash=False
     )
     membership_timestamp = attr.ib(converter=int, default=0, cmp=False, hash=False)
+    membership_written_on = attr.ib(converter=int, default=0, cmp=False, hash=False)
     membership_type = attr.ib(
         converter=str,
         default="",
@@ -32,7 +33,6 @@ class Identity:
         cmp=False,
         hash=False,
     )
-    membership_written_on = attr.ib(converter=int, default=0, cmp=False, hash=False)
     sentry = attr.ib(converter=bool, default=False, cmp=False, hash=False)
 
     def document(self):