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diff --git a/src/liblzma/delta/delta_private.h b/src/liblzma/delta/delta_private.h
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+++ b/src/liblzma/delta/delta_private.h
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_private.h
+/// \brief      Private common stuff for Delta encoder and decoder
+//
+//  Copyright (C) 2007 Lasse Collin
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_DELTA_PRIVATE_H
+#define LZMA_DELTA_PRIVATE_H
+
+#include "delta_common.h"
+
+struct lzma_coder_s {
+	/// Next coder in the chain
+	lzma_next_coder next;
+
+	/// Delta distance
+	size_t distance;
+
+	/// Position in history[]
+	uint8_t pos;
+
+	/// Buffer to hold history of the original data
+	uint8_t history[LZMA_DELTA_DIST_MAX];
+};
+
+
+extern lzma_ret lzma_delta_coder_init(
+		lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters, lzma_code_function code);
+
+#endif