diff --git a/kimchi/src/circuits/constraints.rs b/kimchi/src/circuits/constraints.rs
index b53c925f20..c880d2cdcf 100644
--- a/kimchi/src/circuits/constraints.rs
+++ b/kimchi/src/circuits/constraints.rs
@@ -356,7 +356,7 @@ impl<F: PrimeField, G: KimchiCurve<ScalarField = F>, OpeningProof: OpenProof<G>>
             }
 
             // for public gates, only the left wire is toggled
-            if row < self.cs.public && gate.coeffs.get(0) != Some(&F::one()) {
+            if row < self.cs.public && gate.coeffs.first() != Some(&F::one()) {
                 return Err(GateError::IncorrectPublic(row));
             }
 
diff --git a/msm/src/fec/interpreter.rs b/msm/src/fec/interpreter.rs
index 7bc16698a1..37dd602444 100644
--- a/msm/src/fec/interpreter.rs
+++ b/msm/src/fec/interpreter.rs
@@ -427,7 +427,7 @@ pub fn ec_add_circuit<
     let xr: Ff = slope * slope - xp - xq;
     let yr: Ff = slope * (xp - xr) - yp;
 
-    let two_bi: BigInt = TryFrom::try_from(2).unwrap();
+    let two_bi: BigInt = BigInt::from(2);
 
     let large_limb_size: F = From::from(1u128 << LIMB_BITSIZE_LARGE);
 
diff --git a/msm/src/serialization/interpreter.rs b/msm/src/serialization/interpreter.rs
index d4353a1863..7ad0637f30 100644
--- a/msm/src/serialization/interpreter.rs
+++ b/msm/src/serialization/interpreter.rs
@@ -542,7 +542,7 @@ pub fn multiplication_circuit<
 ) -> Ff {
     let coeff_result = chal * coeff_input;
 
-    let two_bi: BigInt = TryFrom::try_from(2).unwrap();
+    let two_bi: BigInt = BigInt::from(2);
 
     let large_limb_size: F = From::from(1u128 << LIMB_BITSIZE_LARGE);
 
diff --git a/o1vm/src/cannon.rs b/o1vm/src/cannon.rs
index a888bf898d..2fd72c920a 100644
--- a/o1vm/src/cannon.rs
+++ b/o1vm/src/cannon.rs
@@ -307,6 +307,35 @@ impl Meta {
     }
 }
 
+pub const HINT_CLIENT_READ_FD: i32 = 3;
+pub const HINT_CLIENT_WRITE_FD: i32 = 4;
+pub const PREIMAGE_CLIENT_READ_FD: i32 = 5;
+pub const PREIMAGE_CLIENT_WRITE_FD: i32 = 6;
+
+pub struct Preimage(Vec<u8>);
+
+impl Preimage {
+    pub fn create(v: Vec<u8>) -> Self {
+        Preimage(v)
+    }
+
+    pub fn get(self) -> Vec<u8> {
+        self.0
+    }
+}
+
+pub struct Hint(Vec<u8>);
+
+impl Hint {
+    pub fn create(v: Vec<u8>) -> Self {
+        Hint(v)
+    }
+
+    pub fn get(self) -> Vec<u8> {
+        self.0
+    }
+}
+
 #[cfg(test)]
 mod tests {
 
@@ -480,32 +509,3 @@ mod tests {
         assert!(PreimageKey::from_str("0x01").is_err());
     }
 }
-
-pub const HINT_CLIENT_READ_FD: i32 = 3;
-pub const HINT_CLIENT_WRITE_FD: i32 = 4;
-pub const PREIMAGE_CLIENT_READ_FD: i32 = 5;
-pub const PREIMAGE_CLIENT_WRITE_FD: i32 = 6;
-
-pub struct Preimage(Vec<u8>);
-
-impl Preimage {
-    pub fn create(v: Vec<u8>) -> Self {
-        Preimage(v)
-    }
-
-    pub fn get(self) -> Vec<u8> {
-        self.0
-    }
-}
-
-pub struct Hint(Vec<u8>);
-
-impl Hint {
-    pub fn create(v: Vec<u8>) -> Self {
-        Hint(v)
-    }
-
-    pub fn get(self) -> Vec<u8> {
-        self.0
-    }
-}
diff --git a/utils/src/field_helpers.rs b/utils/src/field_helpers.rs
index 00f8827d06..5ceb7c1752 100644
--- a/utils/src/field_helpers.rs
+++ b/utils/src/field_helpers.rs
@@ -84,9 +84,7 @@ pub trait FieldHelpers<F> {
     where
         F: PrimeField,
     {
-        big.clone()
-            .try_into()
-            .map_err(|_| FieldHelpersError::DeserializeBytes)
+        Ok(F::from(big.clone()))
     }
 
     /// Serialize to bytes