diff --git a/spki/src/algorithm.rs b/spki/src/algorithm.rs
index 8997c4a60..ef2c39553 100644
--- a/spki/src/algorithm.rs
+++ b/spki/src/algorithm.rs
@@ -14,7 +14,7 @@ use der::{Decodable, DecodeValue, Decoder, DerOrd, Encodable, Header, Sequence,
 /// ```
 ///
 /// [RFC 5280 Section 4.1.1.2]: https://tools.ietf.org/html/rfc5280#section-4.1.1.2
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
 pub struct AlgorithmIdentifier<'a> {
     /// Algorithm OID, i.e. the `algorithm` field in the `AlgorithmIdentifier`
     /// ASN.1 schema.