diff --git a/hashes/src/hmac/mod.rs b/hashes/src/hmac/mod.rs
index 2d70253fc..d69c3ccc2 100644
--- a/hashes/src/hmac/mod.rs
+++ b/hashes/src/hmac/mod.rs
@@ -15,8 +15,9 @@ use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use crate::{Hash, HashEngine};
 
 /// A hash computed from a RFC 2104 HMAC. Parameterized by the underlying hash function.
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Copy, Clone, PartialOrd, Ord, Hash)]
 #[repr(transparent)]
+#[allow(clippy::derived_hash_with_manual_eq)]
 pub struct Hmac<T: Hash>(T);
 
 impl<T: Hash + str::FromStr> str::FromStr for Hmac<T> {
@@ -24,6 +25,14 @@ impl<T: Hash + str::FromStr> str::FromStr for Hmac<T> {
     fn from_str(s: &str) -> Result<Self, Self::Err> { Ok(Hmac(str::FromStr::from_str(s)?)) }
 }
 
+impl<T: Hash> PartialEq for Hmac<T> {
+    fn eq(&self, other: &Self) -> bool {
+        crate::cmp::fixed_time_eq(self.as_ref(), other.as_ref())
+    }
+}
+
+impl<T: Hash> Eq for Hmac<T> {}
+
 /// Pair of underlying hash engines, used for the inner and outer hash of HMAC.
 #[derive(Debug, Clone)]
 pub struct HmacEngine<T: HashEngine> {