diff --git a/evm/src/cpu/kernel/tests/bignum/mod.rs b/evm/src/cpu/kernel/tests/bignum/mod.rs
index 12772db7..14de0945 100644
--- a/evm/src/cpu/kernel/tests/bignum/mod.rs
+++ b/evm/src/cpu/kernel/tests/bignum/mod.rs
@@ -197,7 +197,9 @@ fn test_addmul_bignum(a: BigUint, b: BigUint, c: u128, expected_output: BigUint)
     if carry_limb > 0.into() {
         new_memory[len] = carry_limb;
     }
-    let output = mem_vec_to_biguint(&new_memory[a_start_loc..a_start_loc + len]);
+    
+    let expected_output = biguint_to_mem_vec(expected_output);
+    let output = &new_memory[a_start_loc..a_start_loc + expected_output.len()];
     assert_eq!(output, expected_output);
 
     Ok(())