diff --git a/neo4j/migrate.sh b/neo4j/migrate.sh
index 1ec5212..d18f24c 100755
--- a/neo4j/migrate.sh
+++ b/neo4j/migrate.sh
@@ -15,4 +15,5 @@ CREATE CONSTRAINT ON (p:Post)          ASSERT p.slug IS UNIQUE;
 CREATE CONSTRAINT ON (c:Category)      ASSERT c.slug IS UNIQUE;
 CREATE CONSTRAINT ON (u:User)          ASSERT u.slug IS UNIQUE;
 CREATE CONSTRAINT ON (o:Organization)  ASSERT o.slug IS UNIQUE;
+CREATE CONSTRAINT ON (n)               ASSERT n.id IS UNIQUE;
 '  | cypher-shell