diff --git a/hsarback/src/de/hsadmin/mods/dom/Domain.java b/hsarback/src/de/hsadmin/mods/dom/Domain.java
index d149c22..13c49a7 100644
--- a/hsarback/src/de/hsadmin/mods/dom/Domain.java
+++ b/hsarback/src/de/hsadmin/mods/dom/Domain.java
@@ -53,7 +53,6 @@ public class Domain extends AbstractEntity {
 	@Temporal(javax.persistence.TemporalType.DATE)
 	private Date since;
 
-	@AnnFieldIO(validation="[a-z0-9\\-\\.]*", rw=ReadWriteAccess.WRITEONCE)
 	@Column(name = "domain_dns_master", columnDefinition = "character varying(64)")
 	private String dnsMaster;