diff --git a/NewHorizons/External/Configs/StarSystemConfig.cs b/NewHorizons/External/Configs/StarSystemConfig.cs
index bf4cef06..bfed6035 100644
--- a/NewHorizons/External/Configs/StarSystemConfig.cs
+++ b/NewHorizons/External/Configs/StarSystemConfig.cs
@@ -1,5 +1,5 @@
-using System.Collections.Generic;
 using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using NewHorizons.Utility;
 using Newtonsoft.Json;
@@ -102,8 +102,16 @@ namespace NewHorizons.External.Configs
 
         public class NomaiCoordinates
         {
+            [MinLength(2)]
+            [MaxLength(6)]
             public int[] x;
+            
+            [MinLength(2)]
+            [MaxLength(6)]
             public int[] y;
+            
+            [MinLength(2)]
+            [MaxLength(6)]
             public int[] z;
         }
 
diff --git a/SchemaExporter/SchemaExporter.cs b/SchemaExporter/SchemaExporter.cs
index 87a701bd..7b0634fd 100644
--- a/SchemaExporter/SchemaExporter.cs
+++ b/SchemaExporter/SchemaExporter.cs
@@ -77,6 +77,14 @@ public static class SchemaExporter
                 {"title", _title},
                 {"description", _description}
             });
+
+            if (_title == "Star System Schema")
+            {
+                schema.Definitions["NomaiCoordinates"].Properties["x"].UniqueItems = true;
+                schema.Definitions["NomaiCoordinates"].Properties["y"].UniqueItems = true;
+                schema.Definitions["NomaiCoordinates"].Properties["z"].UniqueItems = true;
+            }
+            
             return schema;
         }
     }