diff --git a/src/liblzma/common/Makefile.inc b/src/liblzma/common/Makefile.inc
index 6ca6addd..67c8e48c 100644
--- a/src/liblzma/common/Makefile.inc
+++ b/src/liblzma/common/Makefile.inc
@@ -70,6 +70,7 @@ liblzma_la_SOURCES += \
 	common/filter_decoder.h \
 	common/filter_flags_decoder.c \
 	common/index_decoder.c \
+	common/index_decoder.h \
 	common/index_hash.c \
 	common/stream_buffer_decoder.c \
 	common/stream_decoder.c \
diff --git a/src/liblzma/common/index_decoder.c b/src/liblzma/common/index_decoder.c
index cc07a1b8..e71fc6df 100644
--- a/src/liblzma/common/index_decoder.c
+++ b/src/liblzma/common/index_decoder.c
@@ -10,7 +10,7 @@
 //
 ///////////////////////////////////////////////////////////////////////////////
 
-#include "index.h"
+#include "index_decoder.h"
 #include "check.h"
 
 
@@ -265,11 +265,11 @@ index_decoder_reset(lzma_index_coder *coder, const lzma_allocator *allocator,
 }
 
 
-static lzma_ret
-index_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
+extern lzma_ret
+lzma_index_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
 		lzma_index **i, uint64_t memlimit)
 {
-	lzma_next_coder_init(&index_decoder_init, next, allocator);
+	lzma_next_coder_init(&lzma_index_decoder_init, next, allocator);
 
 	if (i == NULL)
 		return LZMA_PROG_ERROR;
@@ -296,7 +296,7 @@ index_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
 extern LZMA_API(lzma_ret)
 lzma_index_decoder(lzma_stream *strm, lzma_index **i, uint64_t memlimit)
 {
-	lzma_next_strm_init(index_decoder_init, strm, i, memlimit);
+	lzma_next_strm_init(lzma_index_decoder_init, strm, i, memlimit);
 
 	strm->internal->supported_actions[LZMA_RUN] = true;
 	strm->internal->supported_actions[LZMA_FINISH] = true;
diff --git a/src/liblzma/common/index_decoder.h b/src/liblzma/common/index_decoder.h
new file mode 100644
index 00000000..1af433b5
--- /dev/null
+++ b/src/liblzma/common/index_decoder.h
@@ -0,0 +1,24 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       index_decoder.h
+/// \brief      Decodes the Index field
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_INDEX_DECODER_H
+#define LZMA_INDEX_DECODER_H
+
+#include "index.h"
+
+
+extern lzma_ret lzma_index_decoder_init(lzma_next_coder *next,
+		const lzma_allocator *allocator,
+		lzma_index **i, uint64_t memlimit);
+
+
+#endif