diff --git a/identity/src/ed25519.rs b/identity/src/ed25519.rs
index 23d11932..06708ce6 100644
--- a/identity/src/ed25519.rs
+++ b/identity/src/ed25519.rs
@@ -128,7 +128,7 @@ impl hash::Hash for PublicKey {
 
 impl cmp::PartialOrd for PublicKey {
     fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
-        self.0.as_bytes().partial_cmp(other.0.as_bytes())
+        Some(self.cmp(other))
     }
 }
 
diff --git a/identity/src/secp256k1.rs b/identity/src/secp256k1.rs
index a32a64e7..94b9b917 100644
--- a/identity/src/secp256k1.rs
+++ b/identity/src/secp256k1.rs
@@ -178,7 +178,7 @@ impl hash::Hash for PublicKey {
 
 impl cmp::PartialOrd for PublicKey {
     fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
-        self.to_bytes().partial_cmp(&other.to_bytes())
+        Some(self.cmp(other))
     }
 }