diff --git a/tar/asm/seek.go b/tar/asm/seek.go
new file mode 100644
index 0000000..54d3198
--- /dev/null
+++ b/tar/asm/seek.go
@@ -0,0 +1,10 @@
+package asm
+
+import "io"
+
+// ReadSeekCloser implements Read(), Seek() and Close()
+type ReadSeekCloser interface {
+	io.Reader
+	io.Seeker
+	io.Closer
+}