diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index ecc721d..418d270 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -134,6 +134,7 @@
 
 int crypto_register_instance(struct crypto_template *tmpl,
 			     struct crypto_instance *inst);
+int crypto_unregister_instance(struct crypto_alg *alg);
 
 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 		      struct crypto_instance *inst, u32 mask);