diff --git a/crypto/lrw.c b/crypto/lrw.c
index b410508..621095d 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -228,13 +228,18 @@
 	crypto_free_cipher(ctx->child);
 }
 
-static struct crypto_instance *alloc(void *param, unsigned int len)
+static struct crypto_instance *alloc(struct rtattr **tb)
 {
 	struct crypto_instance *inst;
 	struct crypto_alg *alg;
+	int err;
 
-	alg = crypto_get_attr_alg(param, len, CRYPTO_ALG_TYPE_CIPHER,
-				  CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
+	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
+	if (err)
+		return ERR_PTR(err);
+
+	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
+				  CRYPTO_ALG_TYPE_MASK);
 	if (IS_ERR(alg))
 		return ERR_PTR(PTR_ERR(alg));