diff --git a/Elwig/Models/WineAttr.cs b/Elwig/Models/WineAttr.cs
index c44d98d..dfe8bea 100644
--- a/Elwig/Models/WineAttr.cs
+++ b/Elwig/Models/WineAttr.cs
@@ -11,7 +11,7 @@ namespace Elwig.Models {
         public string Name { get; set; }
 
         [Column("max_kg_per_ha")]
-        public int MaxKgPerHa { get; set; }
+        public int? MaxKgPerHa { get; set; }
 
         [Column("active")]
         public bool IsActive { get; set; }