diff --git a/src/Pipedrive.net/Models/Response/Leads/AbstractLead.cs b/src/Pipedrive.net/Models/Response/Leads/AbstractLead.cs
index a1a43e13..f8d22f5d 100644
--- a/src/Pipedrive.net/Models/Response/Leads/AbstractLead.cs
+++ b/src/Pipedrive.net/Models/Response/Leads/AbstractLead.cs
@@ -28,7 +28,7 @@ public abstract class AbstractLead
         public string Note { get; set; }
 
         [JsonProperty("person_id")]
-        public long PersonId { get; set; }
+        public long? PersonId { get; set; }
 
         [JsonProperty("organization_id")]
         public long? OrganizationId { get; set; }