diff --git a/src/Umbraco.Core/Models/PropertyCollection.cs b/src/Umbraco.Core/Models/PropertyCollection.cs
index 67a6914739..21c7bf5efc 100644
--- a/src/Umbraco.Core/Models/PropertyCollection.cs
+++ b/src/Umbraco.Core/Models/PropertyCollection.cs
@@ -95,6 +95,7 @@ namespace Umbraco.Core.Models
                         var property = this[key];
                         if (item.Value == null && property.Value != null)
                         {
+                            item.Id = property.Id;
                             item.Value = property.Value;
                         }