diff --git a/src/uint/boxed/div.rs b/src/uint/boxed/div.rs
index 6663991f..0dd18c45 100644
--- a/src/uint/boxed/div.rs
+++ b/src/uint/boxed/div.rs
@@ -50,7 +50,7 @@ impl BoxedUint {
     ///
     /// Variable-time with respect to `rhs`
     pub fn div_rem_vartime(&self, rhs: &NonZero<Self>) -> (Self, Self) {
-        let yc = ((rhs.0.bits_vartime() + Limb::BITS - 1) / Limb::BITS) as usize;
+        let yc = rhs.0.bits_vartime().div_ceil(Limb::BITS) as usize;
 
         match yc {
             0 => panic!("zero divisor"),
@@ -75,7 +75,7 @@ impl BoxedUint {
     ///
     /// Variable-time with respect to `rhs`.
     pub fn rem_vartime(&self, rhs: &NonZero<Self>) -> Self {
-        let yc = ((rhs.0.bits_vartime() + Limb::BITS - 1) / Limb::BITS) as usize;
+        let yc = rhs.0.bits_vartime().div_ceil(Limb::BITS) as usize;
 
         match yc {
             0 => panic!("zero divisor"),
diff --git a/src/uint/encoding.rs b/src/uint/encoding.rs
index fb316809..b83899a5 100644
--- a/src/uint/encoding.rs
+++ b/src/uint/encoding.rs
@@ -532,7 +532,7 @@ pub(crate) fn radix_encode_limbs_mut_to_string(radix: u32, limbs: &mut [Limb]) -
     let mut out;
     if radix.is_power_of_two() {
         let bits = radix.trailing_zeros() as usize;
-        let size = (limbs.len() * Limb::BITS as usize + bits - 1) / bits;
+        let size = (limbs.len() * Limb::BITS as usize).div_ceil(bits);
         out = vec![0u8; size];
         radix_encode_limbs_by_shifting(radix, limbs, &mut out[..]);
     } else {