diff --git a/src/main/java/de/tavolio/realm/client/ClientEntity.java b/src/main/java/de/tavolio/realm/client/ClientEntity.java
index 140c48c..17f102f 100644
--- a/src/main/java/de/tavolio/realm/client/ClientEntity.java
+++ b/src/main/java/de/tavolio/realm/client/ClientEntity.java
@@ -10,6 +10,7 @@ import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 @Entity
 @Table(name = "client")
@@ -36,7 +37,7 @@ public class ClientEntity implements RealmScoped
         joinColumns = @JoinColumn(name = "client_id")
     )
     @Column(name = "permission")
-    private Set<Permission> permissions = new HashSet<>();
+    private Set<String> permissions = new HashSet<>();
 
     public String getId()
     {
@@ -95,12 +96,12 @@ public class ClientEntity implements RealmScoped
 
     public Set<Permission> getPermissions()
     {
-        return permissions;
+        return permissions.stream().map(Permission::valueOf).collect(Collectors.toSet());
     }
 
     public ClientEntity setPermissions(Set<Permission> permissions)
     {
-        this.permissions = permissions;
+        this.permissions = permissions.stream().map(Enum::toString).collect(Collectors.toSet());
         return this;
     }
 }