diff --git a/crypto/algapi.c b/crypto/algapi.c
index 0f1976eceb27..f1d0307b1d08 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -551,17 +551,13 @@ err:
 }
 EXPORT_SYMBOL_GPL(crypto_register_instance);
 
-int crypto_unregister_instance(struct crypto_alg *alg)
+int crypto_unregister_instance(struct crypto_instance *inst)
 {
-	struct crypto_instance *inst = (void *)alg;
 	LIST_HEAD(list);
 
-	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
-		return -EINVAL;
-
 	down_write(&crypto_alg_sem);
 
-	crypto_remove_spawns(alg, &list, NULL);
+	crypto_remove_spawns(&inst->alg, &list, NULL);
 	crypto_remove_instance(inst, &list);
 
 	up_write(&crypto_alg_sem);
diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index c5148a35ae0a..eab249723830 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -316,7 +316,7 @@ static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (atomic_read(&alg->cra_refcnt) != 1)
 		return -EBUSY;
 
-	return crypto_unregister_instance(alg);
+	return crypto_unregister_instance((struct crypto_instance *)alg);
 }
 
 static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 623a59c1ff5a..0ecb7688af71 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -137,7 +137,7 @@ struct crypto_template *crypto_lookup_template(const char *name);
 
 int crypto_register_instance(struct crypto_template *tmpl,
 			     struct crypto_instance *inst);
-int crypto_unregister_instance(struct crypto_alg *alg);
+int crypto_unregister_instance(struct crypto_instance *inst);
 
 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 		      struct crypto_instance *inst, u32 mask);