diff --git a/GreenArrow.Engine/Model/DkimKey.cs b/GreenArrow.Engine/Model/DkimKey.cs
index 162dedd..1d71073 100644
--- a/GreenArrow.Engine/Model/DkimKey.cs
+++ b/GreenArrow.Engine/Model/DkimKey.cs
@@ -22,7 +22,7 @@ public class DkimKey
         /// <summary>
         /// Whether this is the default DKIM key for this domain.
         /// </summary>
-        public string DefaultForDomain { get; init; }
+        public bool DefaultForDomain { get; init; }
 
         /// <summary>
         /// The key data