diff --git a/libarchive/archive_write_add_filter_xz.c b/libarchive/archive_write_add_filter_xz.c
index 46a6c38..b0f25a6 100644
--- a/libarchive/archive_write_add_filter_xz.c
+++ b/libarchive/archive_write_add_filter_xz.c
@@ -233,7 +233,7 @@ archive_compressor_xz_init_stream(struct archive_write_filter *f,
 	if (f->code == ARCHIVE_FILTER_XZ) {
 #ifdef HAVE_LZMA_STREAM_ENCODER_MT
 		if (data->threads != 1) {
-			bzero(&mt_options, sizeof(mt_options));
+			memset(&mt_options, 0, sizeof(mt_options));
 			mt_options.threads = data->threads;
 			mt_options.timeout = 300;
 			mt_options.filters = data->lzmafilters;
diff --git a/libarchive/archive_write_set_format_xar.c b/libarchive/archive_write_set_format_xar.c
index a2dbc03..15a013c 100644
--- a/libarchive/archive_write_set_format_xar.c
+++ b/libarchive/archive_write_set_format_xar.c
@@ -2913,7 +2913,7 @@ compression_init_encoder_xz(struct archive *a,
 	*strm = lzma_init_data;
 #ifdef HAVE_LZMA_STREAM_ENCODER_MT
 	if (threads > 1) {
-		bzero(&mt_options, sizeof(mt_options));
+		memset(&mt_options, 0, sizeof(mt_options));
 		mt_options.threads = threads;
 		mt_options.timeout = 300;
 		mt_options.filters = lzmafilters;