diff --git a/evm/src/cpu/kernel/opcodes.rs b/evm/src/cpu/kernel/opcodes.rs
index 2325c53a..c5133050 100644
--- a/evm/src/cpu/kernel/opcodes.rs
+++ b/evm/src/cpu/kernel/opcodes.rs
@@ -2,7 +2,7 @@
 pub(crate) fn get_push_opcode(n: u8) -> u8 {
     assert!(n > 0);
     assert!(n <= 32);
-    0x60 + (n as u8 - 1)
+    0x60 + n - 1
 }
 
 /// The opcode of a standard instruction (not a `PUSH`).
diff --git a/evm/src/cpu/kernel/tests/ripemd.rs b/evm/src/cpu/kernel/tests/ripemd.rs
index 6123c336..305548ec 100644
--- a/evm/src/cpu/kernel/tests/ripemd.rs
+++ b/evm/src/cpu/kernel/tests/ripemd.rs
@@ -46,7 +46,7 @@ fn test_ripemd_reference() -> Result<()> {
 
         let kernel = combined_kernel();
         let initial_offset = kernel.global_labels["ripemd_stack"];
-        let initial_stack: Vec<U256> = input.iter().map(|&x| U256::from(x as u32)).rev().collect();
+        let initial_stack: Vec<U256> = input.iter().map(|&x| U256::from(x)).rev().collect();
         let final_stack: Vec<U256> = run_with_kernel(&kernel, initial_offset, initial_stack)?
             .stack()
             .to_vec();
diff --git a/field/src/types.rs b/field/src/types.rs
index b112fde2..545f90c5 100644
--- a/field/src/types.rs
+++ b/field/src/types.rs
@@ -455,7 +455,7 @@ pub trait PrimeField: Field {
             let mut x = w * *self;
             let mut b = x * w;
 
-            let mut v = Self::TWO_ADICITY as usize;
+            let mut v = Self::TWO_ADICITY;
 
             while !b.is_one() {
                 let mut k = 0usize;
diff --git a/plonky2/src/gadgets/arithmetic_extension.rs b/plonky2/src/gadgets/arithmetic_extension.rs
index 23caeac1..23c401b8 100644
--- a/plonky2/src/gadgets/arithmetic_extension.rs
+++ b/plonky2/src/gadgets/arithmetic_extension.rs
@@ -443,7 +443,7 @@ impl<F: RichField + Extendable<D>, const D: usize> CircuitBuilder<F, D> {
         let mut current = base;
         let mut product = self.one_extension();
 
-        for j in 0..bits_u64(exponent as u64) {
+        for j in 0..bits_u64(exponent) {
             if j != 0 {
                 current = self.square_extension(current);
             }