diff --git a/libarchive/archive_read_support_compression_lzma.c b/libarchive/archive_read_support_compression_lzma.c
index 49749ed..144f1bf 100644
--- a/libarchive/archive_read_support_compression_lzma.c
+++ b/libarchive/archive_read_support_compression_lzma.c
@@ -119,6 +119,24 @@ lzma_reader_bid(struct archive_reader *self, const void *buff, size_t len)
 	if (buffer[0] != 0x5d)	/* Verify first ID byte. */
 		return (0);
 	bits_checked += 8;
+	if (len < 2)
+		return (bits_checked);
+
+	if (buffer[1] != 0x00)
+		return (0);
+	bits_checked += 8;
+	if (len < 3)
+		return (bits_checked);
+
+	if (buffer[2] != 0x00)
+		return (0);
+	bits_checked += 8;
+	if (len < 6)
+		return (bits_checked);
+
+	if (buffer[5] != 0x00)
+		return (0);
+	bits_checked += 8;
 
 	return (bits_checked);
 }