diff --git a/src/main/resources/v5.sql b/src/main/resources/v5.sql
index 399d831..985da09 100644
--- a/src/main/resources/v5.sql
+++ b/src/main/resources/v5.sql
@@ -10,7 +10,8 @@ create table camp.t_registration(
 	camp camp.enum_camp not null,
 	forename text not null,
 	surname text not null,
-	sex camp.enum_sex not null
+	sex camp.enum_sex not null,
+	unique(camp, forename, surname)
 );
 
 create view camp.v_participant as