diff --git a/crates/vfio-ioctls/src/fam.rs b/crates/vfio-ioctls/src/fam.rs
index f910f7e..60dc96f 100644
--- a/crates/vfio-ioctls/src/fam.rs
+++ b/crates/vfio-ioctls/src/fam.rs
@@ -9,7 +9,7 @@ use std::mem::size_of;
 
 /// Returns a `Vec<T>` with a size in bytes at least as large as `size_in_bytes`.
 fn vec_with_size_in_bytes<T: Default>(size_in_bytes: usize) -> Vec<T> {
-    let rounded_size = (size_in_bytes + size_of::<T>() - 1) / size_of::<T>();
+    let rounded_size = size_in_bytes.div_ceil(size_of::<T>());
     let mut v = Vec::with_capacity(rounded_size);
     for _ in 0..rounded_size {
         v.push(T::default())