diff --git a/config/models b/config/models
index 65ab350..c87ee40 100644
--- a/config/models
+++ b/config/models
@@ -39,6 +39,7 @@ Person
     UniquePersonIdent ident
     UniquePersonLogin login
     UniquePersonEmail email
+    UniquePersonInbox inbox
 
 OutboxItem
     person    PersonId
diff --git a/src/Vervis/Migration.hs b/src/Vervis/Migration.hs
index e00f662..50ef528 100644
--- a/src/Vervis/Migration.hs
+++ b/src/Vervis/Migration.hs
@@ -593,6 +593,8 @@ changes hLocal ctx =
       -- 104
     , addUnique "InboxItemRemote" $
         Unique "UniqueInboxItemRemote" ["inbox", "activity"]
+      -- 105
+    , addUnique "Person" $ Unique "UniquePersonInbox" ["inbox"]
     ]
 
 migrateDB :: MonadIO m => Text -> HashidsContext -> ReaderT SqlBackend m (Either Text (Int, Int))