diff --git a/ff/src/biginteger/arithmetic.rs b/ff/src/biginteger/arithmetic.rs
index 227c75593..d7b150dde 100644
--- a/ff/src/biginteger/arithmetic.rs
+++ b/ff/src/biginteger/arithmetic.rs
@@ -11,7 +11,6 @@ macro_rules! adc {
 
 /// Sets a = a + b + carry, and returns the new carry.
 #[inline(always)]
-#[allow(unused_mut)]
 #[doc(hidden)]
 pub fn adc(a: &mut u64, b: u64, carry: u64) -> u64 {
     let tmp = *a as u128 + b as u128 + carry as u128;
@@ -21,7 +20,6 @@ pub fn adc(a: &mut u64, b: u64, carry: u64) -> u64 {
 
 /// Sets a = a + b + carry, and returns the new carry.
 #[inline(always)]
-#[allow(unused_mut)]
 #[doc(hidden)]
 pub fn adc_for_add_with_carry(a: &mut u64, b: u64, carry: u8) -> u8 {
     #[cfg(all(target_arch = "x86_64", feature = "asm"))]
@@ -57,7 +55,6 @@ macro_rules! sbb {
 
 /// Sets a = a - b - borrow, and returns the borrow.
 #[inline(always)]
-#[allow(unused_mut)]
 pub(crate) fn sbb(a: &mut u64, b: u64, borrow: u64) -> u64 {
     let tmp = (1u128 << 64) + (*a as u128) - (b as u128) - (borrow as u128);
     *a = tmp as u64;
@@ -66,7 +63,6 @@ pub(crate) fn sbb(a: &mut u64, b: u64, borrow: u64) -> u64 {
 
 /// Sets a = a - b - borrow, and returns the borrow.
 #[inline(always)]
-#[allow(unused_mut)]
 #[doc(hidden)]
 pub fn sbb_for_sub_with_borrow(a: &mut u64, b: u64, borrow: u8) -> u8 {
     #[cfg(all(target_arch = "x86_64", feature = "asm"))]