diff --git a/src/cargo_toml.rs b/src/cargo_toml.rs
index cf17acd4..c4d6700a 100644
--- a/src/cargo_toml.rs
+++ b/src/cargo_toml.rs
@@ -3,6 +3,9 @@ use std::path::Path;
 
 use crate::info_file::ExerciseInfo;
 
+/// Initial capacity of the bins buffer.
+pub const BINS_BUFFER_CAPACITY: usize = 1 << 14;
+
 /// Return the start and end index of the content of the list `bin = […]`.
 /// bin = [xxxxxxxxxxxxxxxxx]
 ///        |start_ind       |
@@ -70,7 +73,7 @@ pub fn updated_cargo_toml(
 ) -> Result<Vec<u8>> {
     let (bins_start_ind, bins_end_ind) = bins_start_end_ind(current_cargo_toml)?;
 
-    let mut updated_cargo_toml = Vec::with_capacity(1 << 13);
+    let mut updated_cargo_toml = Vec::with_capacity(BINS_BUFFER_CAPACITY);
     updated_cargo_toml.extend_from_slice(current_cargo_toml[..bins_start_ind].as_bytes());
     append_bins(
         &mut updated_cargo_toml,
diff --git a/src/dev/check.rs b/src/dev/check.rs
index 81d05ce6..7c35b4f3 100644
--- a/src/dev/check.rs
+++ b/src/dev/check.rs
@@ -7,7 +7,7 @@ use std::{
 };
 
 use crate::{
-    cargo_toml::{append_bins, bins_start_end_ind},
+    cargo_toml::{append_bins, bins_start_end_ind, BINS_BUFFER_CAPACITY},
     info_file::{ExerciseInfo, InfoFile},
     CURRENT_FORMAT_VERSION, DEBUG_PROFILE,
 };
@@ -145,7 +145,7 @@ fn check_cargo_toml(
     let (bins_start_ind, bins_end_ind) = bins_start_end_ind(current_cargo_toml)?;
 
     let old_bins = &current_cargo_toml.as_bytes()[bins_start_ind..bins_end_ind];
-    let mut new_bins = Vec::with_capacity(1 << 13);
+    let mut new_bins = Vec::with_capacity(BINS_BUFFER_CAPACITY);
     append_bins(&mut new_bins, exercise_infos, exercise_path_prefix);
 
     if old_bins != new_bins {