diff --git a/src/SharpCompress/Writers/Tar/TarWriter.Async.cs b/src/SharpCompress/Writers/Tar/TarWriter.Async.cs
index 27bea09e..7f4b3886 100644
--- a/src/SharpCompress/Writers/Tar/TarWriter.Async.cs
+++ b/src/SharpCompress/Writers/Tar/TarWriter.Async.cs
@@ -58,7 +58,7 @@ public partial class TarWriter
             return;
         }
 
-        var header = new TarHeader(WriterOptions.ArchiveEncoding, headerFormat);
+        var header = new TarHeader(WriterOptions.ArchiveEncoding, _headerFormat);
         header.LastModifiedTime = modificationTime ?? TarHeader.EPOCH;
         header.Name = normalizedName;
         header.Size = 0;
@@ -96,7 +96,7 @@ public partial class TarWriter
 
         var realSize = size ?? source.Length;
 
-        var header = new TarHeader(WriterOptions.ArchiveEncoding, headerFormat);
+        var header = new TarHeader(WriterOptions.ArchiveEncoding, _headerFormat);
 
         header.LastModifiedTime = modificationTime ?? TarHeader.EPOCH;
         header.Name = NormalizeFilename(filename);
diff --git a/src/SharpCompress/Writers/Tar/TarWriter.cs b/src/SharpCompress/Writers/Tar/TarWriter.cs
index edb00eac..4ed20335 100644
--- a/src/SharpCompress/Writers/Tar/TarWriter.cs
+++ b/src/SharpCompress/Writers/Tar/TarWriter.cs
@@ -109,7 +109,7 @@ public partial class TarWriter : AbstractWriter
             return; // Skip empty or root directory
         }
 
-        var header = new TarHeader(WriterOptions.ArchiveEncoding, headerFormat);
+        var header = new TarHeader(WriterOptions.ArchiveEncoding, _headerFormat);
         header.LastModifiedTime = modificationTime ?? TarHeader.EPOCH;
         header.Name = normalizedName;
         header.Size = 0;
diff --git a/tests/SharpCompress.Test/Tar/TarArchiveAsyncTests.cs b/tests/SharpCompress.Test/Tar/TarArchiveAsyncTests.cs
index 2d953da3..684f05c2 100644
--- a/tests/SharpCompress.Test/Tar/TarArchiveAsyncTests.cs
+++ b/tests/SharpCompress.Test/Tar/TarArchiveAsyncTests.cs
@@ -25,12 +25,13 @@ public class TarArchiveAsyncTests : ArchiveTests
     [Fact]
     public async ValueTask TarArchiveOpenAsyncStream_Throws_On_NonSeekable_Stream()
     {
-          using Stream stream = new ForwardOnlyStream(
+        using Stream stream = new ForwardOnlyStream(
             File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar"))
         );
 
         await Assert.ThrowsAsync<ArgumentException>(async () =>
             await TarArchive.OpenAsyncArchive(new AsyncOnlyStream(stream))
+        );
     }
 
     [Fact]
diff --git a/tests/SharpCompress.Test/Tar/TarWriterAsyncTests.cs b/tests/SharpCompress.Test/Tar/TarWriterAsyncTests.cs
index 8f7097e9..3a516a04 100644
--- a/tests/SharpCompress.Test/Tar/TarWriterAsyncTests.cs
+++ b/tests/SharpCompress.Test/Tar/TarWriterAsyncTests.cs
@@ -105,7 +105,7 @@ public class TarWriterAsyncTests : WriterTests
     {
         using var stream = new MemoryStream();
         var options = new TarWriterOptions(CompressionType.None, true, TarHeaderWriteFormat.USTAR);
-        using (var writer = new TarWriter(new AsyncOnlyStream(stream), options))
+        await using (var writer = new TarWriter(new AsyncOnlyStream(stream), options))
         using (var content = new MemoryStream(Encoding.UTF8.GetBytes("hello")))
         {
             await writer.WriteAsync("dir/file.txt", content, null);
@@ -124,7 +124,7 @@ public class TarWriterAsyncTests : WriterTests
 
         using var stream = new MemoryStream();
         var options = new TarWriterOptions(CompressionType.None, true, TarHeaderWriteFormat.USTAR);
-        using var writer = new TarWriter(new AsyncOnlyStream(stream), options);
+        await using var writer = new TarWriter(new AsyncOnlyStream(stream), options);
         using var content = new MemoryStream(Encoding.UTF8.GetBytes("hello"));
 
         await Assert.ThrowsAsync<InvalidFormatException>(async () =>
@@ -144,7 +144,7 @@ public class TarWriterAsyncTests : WriterTests
             TarHeaderWriteFormat.GNU_TAR_LONG_LINK
         );
 
-        using (var writer = new TarWriter(new AsyncOnlyStream(stream), options))
+        await using (var writer = new TarWriter(new AsyncOnlyStream(stream), options))
         using (var content = new MemoryStream(Encoding.UTF8.GetBytes("hello")))
         {
             await writer.WriteAsync(longName, content, null);
@@ -163,7 +163,7 @@ public class TarWriterAsyncTests : WriterTests
 
         using var stream = new MemoryStream();
         var options = new TarWriterOptions(CompressionType.None, true, TarHeaderWriteFormat.USTAR);
-        using var writer = new TarWriter(new AsyncOnlyStream(stream), options);
+        await using var writer = new TarWriter(new AsyncOnlyStream(stream), options);
 
         await Assert.ThrowsAsync<InvalidFormatException>(async () =>
             await writer.WriteDirectoryAsync(longDirectory, null)