6 files changed, 10 insertions, 2 deletions
diff --git a/src/liblzma/common/alone_decoder.c b/src/liblzma/common/alone_decoder.c
index c4d96cda..5c4d60b1 100644
--- a/src/liblzma/common/alone_decoder.c
+++ b/src/liblzma/common/alone_decoder.c
@@ -132,6 +132,7 @@ alone_decode(void *coder_ptr, const lzma_allocator *allocator,
 
 		lzma_filter_info filters[2] = {
 			{
+				.id = LZMA_FILTER_LZMA1,
 				.init = &lzma_lzma_decoder_init,
 				.options = &coder->options,
 			}, {
diff --git a/src/liblzma/common/alone_encoder.c b/src/liblzma/common/alone_encoder.c
index 96c1db70..c9392f37 100644
--- a/src/liblzma/common/alone_encoder.c
+++ b/src/liblzma/common/alone_encoder.c
@@ -129,6 +129,7 @@ alone_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
 	// Initialize the LZMA encoder.
 	const lzma_filter_info filters[2] = {
 		{
+			.id = LZMA_FILTER_LZMA1,
 			.init = &lzma_lzma_encoder_init,
 			.options = (void *)(options),
 		}, {
diff --git a/src/liblzma/common/common.h b/src/liblzma/common/common.h
index b3a624c6..01841de0 100644
--- a/src/liblzma/common/common.h
+++ b/src/liblzma/common/common.h
@@ -162,8 +162,11 @@ typedef void (*lzma_end_function)(
 /// an array of lzma_filter_info structures. This array is used with
 /// lzma_next_filter_init to initialize the filter chain.
 struct lzma_filter_info_s {
-	/// Filter ID. This is used only by the encoder
-	/// with lzma_filters_update().
+	/// Filter ID. This can be used to share the same initiazation
+	/// function *and* data structures with different Filter IDs
+	/// (LZMA_FILTER_LZMA1EXT does it), and also by the encoder
+	/// with lzma_filters_update() if filter chain is updated
+	/// in the middle of a raw stream or Block (LZMA_SYNC_FLUSH).
 	lzma_vli id;
 
 	/// Pointer to function used to initialize the filter.
diff --git a/src/liblzma/common/lzip_decoder.c b/src/liblzma/common/lzip_decoder.c
index 29c83cfa..20794f94 100644
--- a/src/liblzma/common/lzip_decoder.c
+++ b/src/liblzma/common/lzip_decoder.c
@@ -231,6 +231,7 @@ lzip_decode(void *coder_ptr, const lzma_allocator *allocator,
 
 		const lzma_filter_info filters[2] = {
 			{
+				.id = LZMA_FILTER_LZMA1,
 				.init = &lzma_lzma_decoder_init,
 				.options = &coder->options,
 			}, {
diff --git a/src/liblzma/common/microlzma_decoder.c b/src/liblzma/common/microlzma_decoder.c
index d6337816..ba2f10ad 100644
--- a/src/liblzma/common/microlzma_decoder.c
+++ b/src/liblzma/common/microlzma_decoder.c
@@ -95,6 +95,7 @@ microlzma_decode(void *coder_ptr, const lzma_allocator *allocator,
 		options.dict_size = coder->dict_size;
 		lzma_filter_info filters[2] = {
 			{
+				.id = LZMA_FILTER_LZMA1,
 				.init = &lzma_lzma_decoder_init,
 				.options = &options,
 			}, {
diff --git a/src/liblzma/common/microlzma_encoder.c b/src/liblzma/common/microlzma_encoder.c
index 072b500f..d3ef0632 100644
--- a/src/liblzma/common/microlzma_encoder.c
+++ b/src/liblzma/common/microlzma_encoder.c
@@ -116,6 +116,7 @@ microlzma_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
 	// Initialize the LZMA encoder.
 	const lzma_filter_info filters[2] = {
 		{
+			.id = LZMA_FILTER_LZMA1,
 			.init = &lzma_lzma_encoder_init,
 			.options = (void *)(options),
 		}, {