diff --git a/poulpy-core/src/noise/glwe.rs b/poulpy-core/src/noise/glwe.rs
index 5cfb512..8c24d80 100644
--- a/poulpy-core/src/noise/glwe.rs
+++ b/poulpy-core/src/noise/glwe.rs
@@ -52,8 +52,8 @@ where
     {
         let (mut pt_have, scratch_1) = scratch.take_glwe_plaintext(res);
         self.glwe_decrypt(res, &mut pt_have, sk_prepared, scratch_1);
-        // println!("pt_have: {pt_have}");
-        // println!("pt_want: {}", pt_want.to_ref());
+        //println!("pt_have: {pt_have}");
+        //println!("pt_want: {}", pt_want.to_ref());
         self.glwe_sub_inplace(&mut pt_have, pt_want);
         self.glwe_normalize_inplace(&mut pt_have, scratch_1);
         pt_have.data.stats(pt_have.base2k().into(), 0)
diff --git a/poulpy-schemes/src/tfhe/bdd_arithmetic/ciphertexts/fhe_uint_prepared_debug.rs b/poulpy-schemes/src/tfhe/bdd_arithmetic/ciphertexts/fhe_uint_prepared_debug.rs
index 1953803..f527218 100644
--- a/poulpy-schemes/src/tfhe/bdd_arithmetic/ciphertexts/fhe_uint_prepared_debug.rs
+++ b/poulpy-schemes/src/tfhe/bdd_arithmetic/ciphertexts/fhe_uint_prepared_debug.rs
@@ -14,7 +14,7 @@ use poulpy_core::{
 };
 
 use poulpy_hal::api::{ModuleN, ScratchTakeBasic};
-use poulpy_hal::layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, Stats};
+use poulpy_hal::layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, Stats, ZnxZero};
 
 pub struct FheUintPreparedDebug<D: Data, T: UnsignedInteger> {
     pub(crate) bits: Vec<GGSW<D>>,
@@ -99,6 +99,7 @@ impl<D: DataRef, T: UnsignedInteger + ToBits> FheUintPreparedDebug<D, T> {
         for (i, ggsw) in self.bits.iter().enumerate() {
             use poulpy_hal::layouts::ZnxViewMut;
             let (mut pt_want, scratch_1) = scratch.take_scalar_znx(self.n().into(), 1);
+            pt_want.zero();
             pt_want.at_mut(0, 0)[0] = want.bit(i) as i64;
             stats.push(ggsw.noise(module, row, col, &pt_want, sk, scratch_1));
         }
diff --git a/poulpy-schemes/src/tfhe/bdd_arithmetic/tests/test_suite/prepare.rs b/poulpy-schemes/src/tfhe/bdd_arithmetic/tests/test_suite/prepare.rs
index 722b11b..fa39f90 100644
--- a/poulpy-schemes/src/tfhe/bdd_arithmetic/tests/test_suite/prepare.rs
+++ b/poulpy-schemes/src/tfhe/bdd_arithmetic/tests/test_suite/prepare.rs
@@ -84,8 +84,10 @@ where
     for row in 0..c_enc_prep_debug.dnum().as_usize() {
         for col in 0..c_enc_prep_debug.rank().as_usize() + 1 {
             let stats: Vec<Stats> = c_enc_prep_debug.noise(module, row, col, value, sk_glwe_prep, scratch.borrow());
-            for stat in &stats {
-                assert!(stat.std().log2() <= max_noise(col))
+            for (i, stat) in stats.iter().enumerate() {
+                let noise_have: f64 = stat.std().log2();
+                let noise_max: f64 = max_noise(col);
+                assert!(noise_have <= noise_max, "bit: {i} noise_have: {noise_have} > noise_max: {noise_max}")
             }
         }
     }