diff --git a/ic-agent/src/identity/basic.rs b/ic-agent/src/identity/basic.rs
index 9c5f22b2..152f5537 100644
--- a/ic-agent/src/identity/basic.rs
+++ b/ic-agent/src/identity/basic.rs
@@ -6,7 +6,7 @@ use crate::identity::error::PemError;
 
 use ring::signature::{Ed25519KeyPair, KeyPair};
 use simple_asn1::ASN1Block::{BitString, ObjectIdentifier, Sequence};
-use simple_asn1::{oid, to_der};
+use simple_asn1::{oid, to_der, BigUint, OID};
 
 /// A Basic Identity which sign using an ED25519 key pair.
 pub struct BasicIdentity {
diff --git a/ic-agent/src/identity/secp256k1.rs b/ic-agent/src/identity/secp256k1.rs
index 979acdf5..e9ee9900 100644
--- a/ic-agent/src/identity/secp256k1.rs
+++ b/ic-agent/src/identity/secp256k1.rs
@@ -12,7 +12,7 @@ use openssl::pkey::{Private, Public};
 use openssl::sha::sha256;
 use simple_asn1::ASN1Block;
 use simple_asn1::ASN1Block::{BitString, ObjectIdentifier, Sequence};
-use simple_asn1::{oid, to_der};
+use simple_asn1::{oid, to_der, BigUint, OID};
 
 #[derive(Clone, Debug)]
 pub struct Secp256k1Identity {
diff --git a/ic-identity-hsm/src/hsm.rs b/ic-identity-hsm/src/hsm.rs
index 99050a91..20bc3202 100644
--- a/ic-identity-hsm/src/hsm.rs
+++ b/ic-identity-hsm/src/hsm.rs
@@ -9,7 +9,7 @@ use pkcs11::types::{
 };
 use pkcs11::Ctx;
 use simple_asn1::ASN1Block::{BitString, ObjectIdentifier, OctetString, Sequence};
-use simple_asn1::{from_der, oid, to_der, ASN1DecodeErr, ASN1EncodeErr};
+use simple_asn1::{from_der, oid, to_der, ASN1DecodeErr, ASN1EncodeErr, BigUint, OID};
 use std::path::Path;
 use std::ptr;
 use thiserror::Error;