diff --git a/sys/geom/part/g_part_gpt.c b/sys/geom/part/g_part_gpt.c
index a7e9f88df94e..e34384e98605 100644
--- a/sys/geom/part/g_part_gpt.c
+++ b/sys/geom/part/g_part_gpt.c
@@ -735,7 +735,7 @@ g_part_gpt_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
 		sbuf_printf(sb, "HD(%d,GPT,", entry->base.gpe_index);
 		sbuf_printf_uuid(sb, &entry->ent.ent_uuid);
 		sbuf_printf(sb, ",%#jx,%#jx)", (intmax_t)entry->base.gpe_start,
-		    (intmax_t)entry->base.gpe_end);
+		    (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1));
 		sbuf_printf(sb, "</efimedia>\n");
 	} else {
 		/* confxml: scheme information */