diff --git a/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_unsafe.rs b/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_unsafe.rs
index c35ffb6..748b1f3 100644
--- a/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_unsafe.rs
+++ b/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_unsafe.rs
@@ -1,10 +1,10 @@
 // adapted from: https://github.com/geometryxyz/msl-secp256k1
 
-use crate::msm::metal::abstraction::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::host::gpu::{
     create_buffer, create_empty_buffer, get_default_device, read_buffer,
 };
 use crate::msm::metal_msm::host::shader::{compile_metal, write_constants};
+use crate::msm::metal_msm::utils::limbs_conversion::{FromLimbs, ToLimbs};
 use ark_ff::{BigInt, BigInteger};
 use metal::*;
 
diff --git a/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_wide.rs b/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_wide.rs
index fbd1f72..6e2713d 100644
--- a/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_wide.rs
+++ b/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_add_wide.rs
@@ -1,10 +1,10 @@
 // adapted from: https://github.com/geometryxyz/msl-secp256k1
 
-use crate::msm::metal::abstraction::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::host::gpu::{
     create_buffer, create_empty_buffer, get_default_device, read_buffer,
 };
 use crate::msm::metal_msm::host::shader::{compile_metal, write_constants};
+use crate::msm::metal_msm::utils::limbs_conversion::{FromLimbs, ToLimbs};
 use ark_ff::{BigInt, BigInteger};
 use metal::*;
 
diff --git a/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_sub.rs b/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_sub.rs
index 561967d..8a5390e 100644
--- a/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_sub.rs
+++ b/mopro-msm/src/msm/metal_msm/tests/bigint/bigint_sub.rs
@@ -2,11 +2,11 @@
 
 use core::borrow;
 
-use crate::msm::metal::abstraction::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::host::gpu::{
     create_buffer, create_empty_buffer, get_default_device, read_buffer,
 };
 use crate::msm::metal_msm::host::shader::{compile_metal, write_constants};
+use crate::msm::metal_msm::utils::limbs_conversion::{FromLimbs, ToLimbs};
 use ark_ff::{BigInt, BigInteger};
 use metal::*;
 
diff --git a/mopro-msm/src/msm/metal_msm/tests/field/ff_add.rs b/mopro-msm/src/msm/metal_msm/tests/field/ff_add.rs
index 0dda4e1..01d3976 100644
--- a/mopro-msm/src/msm/metal_msm/tests/field/ff_add.rs
+++ b/mopro-msm/src/msm/metal_msm/tests/field/ff_add.rs
@@ -1,10 +1,10 @@
 // adapted from: https://github.com/geometryxyz/msl-secp256k1
 
-use crate::msm::metal::abstraction::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::host::gpu::{
     create_buffer, create_empty_buffer, get_default_device, read_buffer,
 };
 use crate::msm::metal_msm::host::shader::{compile_metal, write_constants};
+use crate::msm::metal_msm::utils::limbs_conversion::{FromLimbs, ToLimbs};
 use ark_bn254::Fr as ScalarField;
 use ark_ff::{BigInt, BigInteger, PrimeField};
 use metal::*;
diff --git a/mopro-msm/src/msm/metal_msm/tests/field/ff_sub.rs b/mopro-msm/src/msm/metal_msm/tests/field/ff_sub.rs
index 7b25f14..f9ac345 100644
--- a/mopro-msm/src/msm/metal_msm/tests/field/ff_sub.rs
+++ b/mopro-msm/src/msm/metal_msm/tests/field/ff_sub.rs
@@ -1,10 +1,10 @@
 // adapted from: https://github.com/geometryxyz/msl-secp256k1
 
-use crate::msm::metal::abstraction::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::host::gpu::{
     create_buffer, create_empty_buffer, get_default_device, read_buffer,
 };
 use crate::msm::metal_msm::host::shader::{compile_metal, write_constants};
+use crate::msm::metal_msm::utils::limbs_conversion::{FromLimbs, ToLimbs};
 use ark_bn254::Fr as ScalarField;
 use ark_ff::{BigInt, BigInteger, PrimeField};
 use metal::*;
diff --git a/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_modified.rs b/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_modified.rs
index 311b274..c814251 100644
--- a/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_modified.rs
+++ b/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_modified.rs
@@ -1,10 +1,10 @@
 // adapted from: https://github.com/geometryxyz/msl-secp256k1
 
-use crate::msm::metal::abstraction::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::host::gpu::{
     create_buffer, create_empty_buffer, get_default_device, read_buffer,
 };
 use crate::msm::metal_msm::host::shader::{compile_metal, write_constants};
+use crate::msm::metal_msm::utils::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::utils::mont_params::{calc_mont_radix, calc_nsafe, calc_rinv_and_n0};
 use ark_bn254::Fr as ScalarField;
 use ark_ff::{BigInt, PrimeField};
diff --git a/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_optimised.rs b/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_optimised.rs
index 7e7ef74..65267eb 100644
--- a/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_optimised.rs
+++ b/mopro-msm/src/msm/metal_msm/tests/mont_backend/mont_mul_optimised.rs
@@ -3,11 +3,11 @@
 // we avoid using ark_ff::ScalarField here because the mont radix exceeds the range of its field
 // and we need to use num_bigint::BigUint for better flexibility
 
-use crate::msm::metal::abstraction::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::host::gpu::{
     create_buffer, create_empty_buffer, get_default_device, read_buffer,
 };
 use crate::msm::metal_msm::host::shader::{compile_metal, write_constants};
+use crate::msm::metal_msm::utils::limbs_conversion::{FromLimbs, ToLimbs};
 use crate::msm::metal_msm::utils::mont_params::{calc_mont_radix, calc_rinv_and_n0};
 use ark_bn254::Fr as ScalarField;
 use ark_ff::{BigInt, PrimeField};