diff --git a/src/SharpCompress/Compressors/Rar/UnpackV1/Unpack.cs b/src/SharpCompress/Compressors/Rar/UnpackV1/Unpack.cs
index 3afa4caa..47904984 100644
--- a/src/SharpCompress/Compressors/Rar/UnpackV1/Unpack.cs
+++ b/src/SharpCompress/Compressors/Rar/UnpackV1/Unpack.cs
@@ -1215,7 +1215,7 @@ internal sealed partial class Unpack : BitInput, IRarUnpack, IDisposable
                 }
 
                 // VM.Prepare(&VMCode[0],VMCodeSize,&Filter->Prg);
-                rarVM.prepare(VMCode, VMCodeSize, Filter.Program);
+                rarVM.prepare(VMCode.AsSpan(0, VMCodeSize), Filter.Program);
             }
             finally
             {
diff --git a/src/SharpCompress/Compressors/Rar/VM/RarVM.cs b/src/SharpCompress/Compressors/Rar/VM/RarVM.cs
index f1ef3834..ce267bad 100644
--- a/src/SharpCompress/Compressors/Rar/VM/RarVM.cs
+++ b/src/SharpCompress/Compressors/Rar/VM/RarVM.cs
@@ -776,9 +776,10 @@ internal sealed class RarVM : BitInput
         }
     }
 
-    public void prepare(ReadOnlySpan<byte> code, int codeSize, VMPreparedProgram prg)
+    public void prepare(ReadOnlySpan<byte> code, VMPreparedProgram prg)
     {
         InitBitInput();
+        var codeSize = code.Length;
         var cpLength = Math.Min(MAX_SIZE, codeSize);
 
         // memcpy(inBuf,Code,Min(CodeSize,BitInput::MAX_SIZE));
@@ -795,7 +796,7 @@ internal sealed class RarVM : BitInput
         prg.CommandCount = 0;
         if (xorSum == code[0])
         {
-            var filterType = IsStandardFilter(code, codeSize);
+            var filterType = IsStandardFilter(code);
             if (filterType != VMStandardFilters.VMSF_NONE)
             {
                 var curCmd = new VMPreparedCommand();
@@ -1105,7 +1106,7 @@ internal sealed class RarVM : BitInput
         }
     }
 
-    private VMStandardFilters IsStandardFilter(ReadOnlySpan<byte> code, int codeSize)
+    private VMStandardFilters IsStandardFilter(ReadOnlySpan<byte> code)
     {
         VMStandardFilterSignature[] stdList =
         {