diff --git a/faststreams/input_stream.nim b/faststreams/input_stream.nim
index 4d47895..20c292a 100644
--- a/faststreams/input_stream.nim
+++ b/faststreams/input_stream.nim
@@ -36,6 +36,8 @@ type
   ByteStreamVar* = ref ByteStream
   AsciiStreamVar* = ref AsciiStream
 
+  InputStreamVar* = ref ByteStream
+
 proc openFile*(filename: string): ByteStreamVar =
   new result
   var memFile = memfiles.open(filename)
@@ -69,6 +71,10 @@ proc init*(T: type BufferedStream,
            asyncReader = AsyncStreamReader(nil)): BufferedStream =
   result.init result.buffer, reader, asyncReader
 
+proc endPos*(s: InputStreamVar): int =
+  # TODO This needs to use a VTable for `system.File` based streams
+  s.bufferEndPos
+
 proc syncRead(s: var ByteStream): bool =
   let bytesRead = s.reader(s.bufferStart, s.bufferSize)
   if bytesRead == 0: