diff --git a/FASTER Maintenance/Models/BasicCfg.cs b/FASTER Maintenance/Models/BasicCfg.cs
index 87e6c5f..eeec89e 100644
--- a/FASTER Maintenance/Models/BasicCfg.cs	
+++ b/FASTER Maintenance/Models/BasicCfg.cs	
@@ -1,6 +1,7 @@
 using System;
 using System.ComponentModel;
 using System.Globalization;
+using Newtonsoft.Json;
 
 // ReSharper disable once CheckNamespace
 namespace FASTER.Models
@@ -125,6 +126,7 @@ public ushort MaxCustomFileSize
             }
         }
 
+        [JsonIgnore]
         public string PerfPreset
         {
             get => "Custom";
diff --git a/FASTER/Models/BasicCfg.cs b/FASTER/Models/BasicCfg.cs
index fa3cf7f..ac96a29 100644
--- a/FASTER/Models/BasicCfg.cs
+++ b/FASTER/Models/BasicCfg.cs
@@ -2,6 +2,7 @@
 using System.ComponentModel;
 using System.Globalization;
 using System.Xml.Serialization;
+using Newtonsoft.Json;
 
 namespace FASTER.Models
 {
@@ -150,6 +151,7 @@ public ushort MaxCustomFileSize
         }
 
         [XmlIgnore]
+        [JsonIgnore]
         public string PerfPreset
         {
             get => "Custom";