diff --git a/digest/src/mac.rs b/digest/src/mac.rs
index df1d0c2b1..ef6b555ed 100644
--- a/digest/src/mac.rs
+++ b/digest/src/mac.rs
@@ -101,7 +101,7 @@ impl<T: KeyInit + Update + FixedOutput + MacMarker> Mac for T {
         if n != Self::OutputSize::USIZE {
             return Err(MacError);
         }
-        let choice = self.finalize_fixed().ct_eq(&tag);
+        let choice = self.finalize_fixed().ct_eq(tag);
         if choice.unwrap_u8() == 1 {
             Ok(())
         } else {