diff --git a/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarEntry.Windows.cs b/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarEntry.Windows.cs
index c48f20834ead09..c0557362961b27 100644
--- a/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarEntry.Windows.cs
+++ b/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarEntry.Windows.cs
@@ -14,14 +14,14 @@ public abstract partial class TarEntry
         // Throws on Windows. Block devices are not supported on this platform.
         private void ExtractAsBlockDevice(string destinationFileName)
         {
-            Debug.Assert(EntryType is TarEntryType.BlockDevice or TarEntryType.CharacterDevice);
+            Debug.Assert(EntryType is TarEntryType.BlockDevice);
             throw new InvalidOperationException(SR.IO_DeviceFiles_NotSupported);
         }
 
         // Throws on Windows. Character devices are not supported on this platform.
         private void ExtractAsCharacterDevice(string destinationFileName)
         {
-            Debug.Assert(EntryType is TarEntryType.BlockDevice or TarEntryType.CharacterDevice);
+            Debug.Assert(EntryType is TarEntryType.CharacterDevice);
             throw new InvalidOperationException(SR.IO_DeviceFiles_NotSupported);
         }
 
diff --git a/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarHeader.Write.cs b/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarHeader.Write.cs
index d6d435b1f491b4..bea775a76aac3c 100644
--- a/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarHeader.Write.cs
+++ b/src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarHeader.Write.cs
@@ -509,7 +509,7 @@ private int WriteCommonFields(Span<byte> buffer, TarEntryType actualEntryType)
 
         // Calculates how many data bytes should be written, depending on the position pointer of the stream.
         // Only works if the stream is seekable.
-        public long GetTotalDataBytesToWrite()
+        internal long GetTotalDataBytesToWrite()
         {
             if (_dataStream == null)
             {