1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/src/util/io/BaseInputStream.cs b/crypto/src/util/io/BaseInputStream.cs
index ebe256632..eaaf9556d 100644
--- a/crypto/src/util/io/BaseInputStream.cs
+++ b/crypto/src/util/io/BaseInputStream.cs
@@ -45,5 +45,9 @@ namespace Org.BouncyCastle.Utilities.IO
         public sealed override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
         public sealed override void SetLength(long value) { throw new NotSupportedException(); }
         public sealed override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        public override void Write(ReadOnlySpan<byte> buffer) { throw new NotSupportedException(); }
+#endif
     }
 }