diff --git a/sys/sys/gpt.h b/sys/sys/gpt.h
index f5b17e19eb1f..95a6cda8c011 100644
--- a/sys/sys/gpt.h
+++ b/sys/sys/gpt.h
@@ -46,7 +46,8 @@ struct gpt_hdr {
 	uint32_t	hdr_entries;
 	uint32_t	hdr_entsz;
 	uint32_t	hdr_crc_table;
-} __attribute__((packed));
+	char		padding[];	/* XXX: struct not a multiple of 8. */
+};
 
 struct gpt_ent {
 	struct uuid	ent_type;