diff --git a/src/redmine-net-api/Types/Version.cs b/src/redmine-net-api/Types/Version.cs
index b7c8b8d9..e094ee27 100644
--- a/src/redmine-net-api/Types/Version.cs
+++ b/src/redmine-net-api/Types/Version.cs
@@ -145,6 +145,10 @@ public override void WriteXml(XmlWriter writer)
             writer.WriteElementString(RedmineKeys.SHARING, Sharing.ToString().ToLowerInv());
             writer.WriteDateOrEmpty(RedmineKeys.DUE_DATE, DueDate);
             writer.WriteElementString(RedmineKeys.DESCRIPTION, Description);
+            if (CustomFields != null)
+            {
+               writer.WriteArray(RedmineKeys.CUSTOM_FIELDS, CustomFields);
+            }
         }
         #endregion
 
@@ -272,4 +276,4 @@ public override int GetHashCode()
 CustomFields={CustomFields.Dump()}]";
 
     }
-}
\ No newline at end of file
+}