diff --git a/Assets/Mirror/Transports/Encryption/Native/AesGCMEncryptionNative.cs b/Assets/Mirror/Transports/Encryption/Native/AesGCMEncryptionNative.cs
index 580488efdd4..923849585d3 100644
--- a/Assets/Mirror/Transports/Encryption/Native/AesGCMEncryptionNative.cs
+++ b/Assets/Mirror/Transports/Encryption/Native/AesGCMEncryptionNative.cs
@@ -40,7 +40,7 @@ static AesGCMEncryptionNative()
         public static bool IsSupported => _supported;
         public static unsafe ArraySegment<byte> Encrypt(byte[] key, byte[] nonce, ArraySegment<byte> plaintext, ArraySegment<byte> dataOut)
         {
-            plaintext.CopyTo(dataOut);
+            Array.Copy(plaintext.Array, plaintext.Offset, dataOut.Array, dataOut.Offset ,plaintext.Count);
             fixed (byte* keyPtr = key)
             {
                 fixed (byte* noncePtr = nonce)
@@ -57,9 +57,10 @@ public static unsafe ArraySegment<byte> Encrypt(byte[] key, byte[] nonce, ArrayS
                 }
             }
         }
+        
         public static unsafe ArraySegment<byte> Decrypt(byte[] key, byte[] nonce, ArraySegment<byte> ciphertext, ArraySegment<byte> dataOut)
         {
-            ciphertext.CopyTo(dataOut);
+            Array.Copy(ciphertext.Array, ciphertext.Offset, dataOut.Array, dataOut.Offset, ciphertext.Count);
             fixed (byte* keyPtr = key)
             {
                 fixed (byte* noncePtr = nonce)