diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
index b2dae24ebcd..85b31f001f6 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
@@ -291,8 +291,8 @@ static void
 nvlist_get_guids(nvlist_t *list, uint64_t *pguid, uint64_t *vguid)
 {
 
-	nvlist_lookup_uint64(list, ZPOOL_CONFIG_GUID, vguid);
-	nvlist_lookup_uint64(list, ZPOOL_CONFIG_POOL_GUID, pguid);
+	(void) nvlist_lookup_uint64(list, ZPOOL_CONFIG_GUID, vguid);
+	(void) nvlist_lookup_uint64(list, ZPOOL_CONFIG_POOL_GUID, pguid);
 }
 
 static int