diff --git a/ArchiSteamFarm/BotConfig.cs b/ArchiSteamFarm/BotConfig.cs
index c28d816f8..6d2dc0469 100644
--- a/ArchiSteamFarm/BotConfig.cs
+++ b/ArchiSteamFarm/BotConfig.cs
@@ -100,7 +100,7 @@ namespace ArchiSteamFarm {
 		[JsonProperty(Required = Required.DisallowNull)]
 		internal readonly ulong SteamMasterID = 0;
 
-		[JsonProperty]
+		[JsonProperty(Required = Required.DisallowNull)]
 		internal readonly ulong SteamOperatorID = 0;
 
 		[JsonProperty]