diff --git a/src/xz/args.c b/src/xz/args.c
index 97aa3599..eba1b97d 100644
--- a/src/xz/args.c
+++ b/src/xz/args.c
@@ -105,7 +105,7 @@ parse_block_list(const char *str_const)
 			*p = '\0';
 
 		// Use the default filter chain unless overridden.
-		opt_block_list[i].filters_index = 0;
+		opt_block_list[i].chain_num = 0;
 
 		// To specify a filter chain, the block list entry may be
 		// prepended with "[filter-chain-number]:". The size is
@@ -132,9 +132,9 @@ parse_block_list(const char *str_const)
 						"filter chain number '%c:'"),
 						str[0]);
 
-			const unsigned filter_num = (unsigned)(str[0] - '0');
-			opt_block_list[i].filters_index = filter_num;
-			block_list_chain_mask |= 1U << filter_num;
+			const unsigned chain_num = (unsigned)(str[0] - '0');
+			opt_block_list[i].chain_num = chain_num;
+			block_list_chain_mask |= 1U << chain_num;
 			str += 2;
 		} else {
 			// This Block uses the default filter chain.
diff --git a/src/xz/coder.c b/src/xz/coder.c
index c4c5c28d..b2d2c7d9 100644
--- a/src/xz/coder.c
+++ b/src/xz/coder.c
@@ -867,7 +867,7 @@ coder_init(file_pair *pair)
 	// Otherwise, use first filter chain from the block list.
 	lzma_filter *active_filters = opt_block_list == NULL
 			? chains[0]
-			: chains[opt_block_list[0].filters_index];
+			: chains[opt_block_list[0].chain_num];
 
 	if (opt_mode == MODE_COMPRESS) {
 #ifdef HAVE_ENCODERS
@@ -1112,10 +1112,10 @@ split_block(uint64_t *block_remaining,
 			++*list_pos;
 
 			// Update the filters if needed.
-			if (opt_block_list[*list_pos - 1].filters_index
-				!= opt_block_list[*list_pos].filters_index) {
+			if (opt_block_list[*list_pos - 1].chain_num
+				!= opt_block_list[*list_pos].chain_num) {
 				const unsigned chain_idx = opt_block_list
-						[*list_pos].filters_index;
+						[*list_pos].chain_num;
 				const lzma_filter *next = chains[chain_idx];
 				const lzma_ret ret = lzma_filters_update(
 						&strm, next);
diff --git a/src/xz/coder.h b/src/xz/coder.h
index f1fdba01..4e0351bd 100644
--- a/src/xz/coder.h
+++ b/src/xz/coder.h
@@ -38,7 +38,7 @@ typedef struct {
 
 	/// Index into the filters[] representing the filter chain to use
 	/// for this Block.
-	unsigned filters_index;
+	unsigned chain_num;
 } block_list_entry;