diff --git a/src/libraries/System.IO.Compression.Brotli/ref/System.IO.Compression.Brotli.cs b/src/libraries/System.IO.Compression.Brotli/ref/System.IO.Compression.Brotli.cs
index 3e0cbb541d739e..f4020361689559 100644
--- a/src/libraries/System.IO.Compression.Brotli/ref/System.IO.Compression.Brotli.cs
+++ b/src/libraries/System.IO.Compression.Brotli/ref/System.IO.Compression.Brotli.cs
@@ -50,11 +50,13 @@ public override void Flush() { }
         public override int Read(System.Span<byte> buffer) { throw null; }
         public override System.Threading.Tasks.Task<int> ReadAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
         public override System.Threading.Tasks.ValueTask<int> ReadAsync(System.Memory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public override int ReadByte() { throw null; }
         public override long Seek(long offset, System.IO.SeekOrigin origin) { throw null; }
         public override void SetLength(long value) { }
         public override void Write(byte[] buffer, int offset, int count) { }
         public override void Write(System.ReadOnlySpan<byte> buffer) { }
         public override System.Threading.Tasks.Task WriteAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
         public override System.Threading.Tasks.ValueTask WriteAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public override void WriteByte(byte value) { }
     }
 }