diff --git a/net/key/af_key.c b/net/key/af_key.c
index 84209fb..76fa6fe 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1193,6 +1193,7 @@
 			x->aalg->alg_key_len = key->sadb_key_bits;
 			memcpy(x->aalg->alg_key, key+1, keysize);
 		}
+		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
 		x->props.aalgo = sa->sadb_sa_auth;
 		/* x->algo.flags = sa->sadb_sa_flags; */
 	}