diff --git a/pkNX.Containers/SingleFileContainer.cs b/pkNX.Containers/SingleFileContainer.cs
index 9b967266..930975f3 100644
--- a/pkNX.Containers/SingleFileContainer.cs
+++ b/pkNX.Containers/SingleFileContainer.cs
@@ -1,4 +1,5 @@
 using System.IO;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -24,7 +25,16 @@ public void CancelEdits()
             Data = (byte[]) Backup.Clone();
         }
 
-        public byte[] this[int index] { get => Data; set => Data = value; }
+        public byte[] this[int index]
+        {
+            get => (byte[])Data.Clone();
+            set
+            {
+                Modified |= Data.SequenceEqual(value);
+                Data = value;
+            }
+        }
+
         public Task<byte[][]> GetFiles() => Task.FromResult(new[] {Data});
         public Task<byte[]> GetFile(int file, int subFile = 0) => Task.FromResult(Data);
         public Task SetFile(int file, byte[] value, int subFile = 0) => Task.FromResult(Data = value);