diff --git a/src/expand_v2.h b/src/expand_v2.h
deleted file mode 100644
index e2c8fdb..0000000
--- a/src/expand_v2.h
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
- * expand_v2.h - LZSA2 block decompressor definitions
- *
- * Copyright (C) 2019 Emmanuel Marty
- *
- * This software is provided 'as-is', without any express or implied
- * warranty.  In no event will the authors be held liable for any damages
- * arising from the use of this software.
- *
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you must not
- *    claim that you wrote the original software. If you use this software
- *    in a product, an acknowledgment in the product documentation would be
- *    appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- *    misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
-
-/*
- * Uses the libdivsufsort library Copyright (c) 2003-2008 Yuta Mori
- *
- * Inspired by LZ4 by Yann Collet. https://github.com/lz4/lz4
- * With help, ideas, optimizations and speed measurements by spke <zxintrospec@gmail.com>
- * With ideas from Lizard by Przemyslaw Skibinski and Yann Collet. https://github.com/inikep/lizard
- * Also with ideas from smallz4 by Stephan Brumme. https://create.stephan-brumme.com/smallz4/
- *
- */
-
-#ifndef _EXPAND_V2_H
-#define _EXPAND_V2_H
-
-/**
- * Decompress one LZSA2 data block
- *
- * @param pInBlock pointer to compressed data
- * @param nInBlockSize size of compressed data, in bytes
- * @param pOutData pointer to output decompression buffer (previously decompressed bytes + room for decompressing this block)
- * @param nOutDataOffset starting index of where to store decompressed bytes in output buffer (and size of previously decompressed bytes)
- * @param nBlockMaxSize total size of output decompression buffer, in bytes
- *
- * @return size of decompressed data in bytes, or -1 for error
- */
-int lzsa_decompressor_expand_block_v2(const unsigned char *pInBlock, int nBlockSize, unsigned char *pOutData, int nOutDataOffset, int nBlockMaxSize);
-
-#endif /* _EXPAND_V2_H */