diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 99daf2e332f4a6f36183295109247b68d7932f42..c33f61a4cc28d8b772b9444b710e7f55fa6df2fb 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3656,7 +3656,7 @@ static int pool_message(struct dm_target *ti, unsigned argc, char **argv)
 	if (get_pool_mode(pool) >= PM_READ_ONLY) {
 		DMERR("%s: unable to service pool target messages in READ_ONLY or FAIL mode",
 		      dm_device_name(pool->pool_md));
-		return -EINVAL;
+		return -EOPNOTSUPP;
 	}
 
 	if (!strcasecmp(argv[0], "create_thin"))