diff --git a/Hcs.WebApp/Data/Hcs/Operation.cs b/Hcs.WebApp/Data/Hcs/Operation.cs
index 6e63bf2..f0d8513 100644
--- a/Hcs.WebApp/Data/Hcs/Operation.cs
+++ b/Hcs.WebApp/Data/Hcs/Operation.cs
@@ -34,6 +34,8 @@ namespace Hcs.WebApp.Data.Hcs
 
         public virtual ICollection<Registry> Registries { get; set; } = [];
 
+        public virtual ICollection<House> Houses { get; set; } = [];
+
         [NotMapped]
         public bool Completed => EndedAt.HasValue;
     }