diff --git a/backends/concrete-cpu/implementation/src/c_api/wop_pbs.rs b/backends/concrete-cpu/implementation/src/c_api/wop_pbs.rs
index 055a949c76..753b19c710 100644
--- a/backends/concrete-cpu/implementation/src/c_api/wop_pbs.rs
+++ b/backends/concrete-cpu/implementation/src/c_api/wop_pbs.rs
@@ -318,10 +318,7 @@ pub unsafe extern "C" fn concrete_cpu_circuit_bootstrap_boolean_vertical_packing
         assert!(cbs_decomposition_level_count * cbs_decomposition_base_log <= 64);
 
         let mut lut_container = slice::from_raw_parts(lut, lut_size * lut_count);
-        let mut expanded_luts: Vec<u64> = vec![
-            0_u64;
-            fpksk_output_polynomial_size * lut_count
-        ];
+        let mut expanded_luts: Vec<u64> = vec![0_u64; fpksk_output_polynomial_size * lut_count];
 
         if lut_size < fpksk_output_polynomial_size {
             for luti in 0..lut_count {
diff --git a/frontends/concrete-python/tests/conftest.py b/frontends/concrete-python/tests/conftest.py
index dc58f6e644..60629ec8d8 100644
--- a/frontends/concrete-python/tests/conftest.py
+++ b/frontends/concrete-python/tests/conftest.py
@@ -5,13 +5,13 @@
 import json
 import os
 import random
+import warnings
 from copy import deepcopy
 from pathlib import Path
 from typing import Any, Callable, Dict, List, Tuple, Union
 
 import numpy as np
 import pytest
-import warnings
 
 import tests
 from concrete import fhe
@@ -303,8 +303,11 @@ def sanitize(values):
                 if all(np.array_equal(e, a) for e, a in zip(expected, actual)):
                     break
 
-                warnings.warn(UserWarning(f'Test fail ({i+1}/{retries}), regenerate keyset and retry'))
-                circuit.keygen(force=True, seed=i+1)
+                warnings.warn(
+                    UserWarning(f"Test fail ({i+1}/{retries}), regenerate keyset and retry"),
+                    stacklevel=2,
+                )
+                circuit.keygen(force=True, seed=i + 1)
 
                 if i == retries - 1:
                     message = f"""