diff --git a/src/commitment_scheme/merkle_tree.rs b/src/commitment_scheme/merkle_tree.rs
index 34000d775..fac344838 100644
--- a/src/commitment_scheme/merkle_tree.rs
+++ b/src/commitment_scheme/merkle_tree.rs
@@ -11,7 +11,7 @@ use crate::commitment_scheme::utils::{
     tree_data_as_mut_ref, ColumnArray, TreeData,
 };
 use crate::core::fields::{Field, IntoSlice};
-use crate::math::utils::{prev_pow_two, usize_div_ceil};
+use crate::math::utils::prev_pow_two;
 
 pub struct MerkleTree<T: Field + Sized + Debug + Display, H: Hasher> {
     pub bottom_layer: Vec<T>,
@@ -61,7 +61,7 @@ where
         let bottom_layer = column_to_row_major(trace);
 
         // Allocate rest of the tree.
-        let bottom_layer_length_nodes = usize_div_ceil(bottom_layer.len(), bottom_layer_block_size);
+        let bottom_layer_length_nodes = bottom_layer.len().div_ceil(bottom_layer_block_size);
         let tree_data =
             allocate_balanced_tree(bottom_layer_length_nodes, H::BLOCK_SIZE, H::OUTPUT_SIZE);