diff --git a/src/dhkex.rs b/src/dhkex.rs
index bf27779..df9f1dc 100644
--- a/src/dhkex.rs
+++ b/src/dhkex.rs
@@ -44,7 +44,7 @@ pub trait DhKeyExchange {
     ) -> (Self::PrivateKey, Self::PublicKey);
 }
 
-#[cfg(any(feature = "p256", feature = "p384", feature = "k256", feature = "k256"))]
+#[cfg(any(feature = "p256", feature = "p384", feature = "p521", feature = "k256"))]
 pub(crate) mod ecdh_nist;
 
 #[cfg(feature = "x25519")]