diff --git a/libmspack/mshlp_compressor.cs b/libmspack/mshlp_compressor.cs
index a22d86f..9d1bd1d 100644
--- a/libmspack/mshlp_compressor.cs
+++ b/libmspack/mshlp_compressor.cs
@@ -6,5 +6,7 @@ namespace SabreTools.Compression.libmspack
     public class mshlp_compressor
     {
         public int dummy { get; set; }
+
+        public mspack_system system { get; set; }
     }
 }
\ No newline at end of file
diff --git a/libmspack/mshlp_decompressor.cs b/libmspack/mshlp_decompressor.cs
index cd9bef7..18b2933 100644
--- a/libmspack/mshlp_decompressor.cs
+++ b/libmspack/mshlp_decompressor.cs
@@ -6,5 +6,7 @@ namespace SabreTools.Compression.libmspack
     public class mshlp_decompressor
     {
         public int dummy { get; set; }
+
+        public mspack_system system { get; set; }
     }
 }
\ No newline at end of file